#include <iostream>#include <sstream>#include <string.h>using namespace std;void getcb(int& c11, int& c12, int& c21, int& c22, int& b1, int& b2){ c11 = c12 = c22 = c21 = b1 = b2 = 0; int num, i; char str[800]; string word; istringstream strs; bool sub = false, eq = false; cin.getline(str, 800); cin.getline(str, 800); strs.str(str); while(!strs.eof()) { strs>>word; switch(word[word.size() - 1]) { case 'x': num = 0; if(word.size() == 1) num = 1; else if(word.size() == 2 && word[0] == '-') num = -1; else if(word[0] == '-') { for (i=1; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } num = -num; } else { for (i=0; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } } if(sub) num = -num; if(eq) num = -num; sub = false; c11 += num; break; case 'y': num = 0; if(word.size() == 1) num = 1; else if(word.size() == 2 && word[0] == '-') num = -1; else if(word[0] == '-') { for (i=1; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } num = -num; } else { for (i=0; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } } if(sub) num = -num; if(eq) num = -num; sub = false; c12 += num; break; case '-': sub = true; break; case '=': eq = true; break; case '+': break; default: num = 0; if(word[0] == '-') { for (i = 1; i<word.size(); ++i) { num = num * 10 + word[i] - 48; } num = -num; } else { for (i = 0; i<word.size(); ++i) { num = num * 10 + word[i] - 48; } } if(sub) num = -num; if(!eq) num = -num; sub = false; b1 += num; } } eq = false; sub = false; strs.clear(); cin.getline(str, 800); strs.str(str); while (!strs.eof()) { strs>>word; switch(word[word.size() - 1]) { case 'x': num = 0; if(word.size() == 1) num = 1; else if(word.size() == 2 && word[0] == '-') num = -1; else if(word[0] == '-') { for (i=1; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } num = -num; } else { for (i=0; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } } if(sub) num = -num; if(eq) num = -num; sub = false; c21 += num; break; case 'y': num = 0; if(word.size() == 1) num = 1; else if(word.size() == 2 && word[0] == '-') num = -1; else if(word[0] == '-') { for (i=1; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } num = -num; } else { for (i=0; i<word.size() - 1; i++) { num = num * 10 + word[i] - 48; } } if(sub) num = -num; if(eq) num = -num; sub = false; c22 += num; break; case '-': sub = true; break; case '=': eq = true; case '+': break; default: num = 0; if(word[0] == '-') { for (i = 1; i<word.size(); ++i) { num = num * 10 + word[i] - 48; } num = -num; } else { for (i = 0; i<word.size(); ++i) { num = num * 10 + word[i] - 48; } } if(sub) num = -num; if(!eq) num = -num; sub = false; b2 += num; } } }int gcd(int a, int b){ int r, t; if(a < b) { t = a; a = b; b = t; } r = a % b; while (r != 0) { a = b; b = r; r = a % b; } return b;}void print(int a, int b){ int g; if(a == 0) cout<<0<<endl; else { if(a < 0 && b > 0) { a = - a; cout<<"-"; } else if (a > 0 && b < 0) { b = -b; cout<<"-"; } if(a % b == 0) cout<<a/b<<endl; else { g = gcd(a, b); cout<<a/g<<"/"<<b/g<<endl; } }}int main(){ int n; int c11, c12, c21, c22, b1, b2; cin>>n; for(int t = 0; t<n; ++t) { if(t != 0) cout<<endl; getcb(c11, c12, c21, c22, b1, b2); if (c11 == 0) { if (c12 == 0) { if(b1 != 0) { cout<<"don't know"<<endl<<"don't know"<<endl; } else if (c21 == 0 && c22 != 0) { cout<<"don't know"<<endl; print(b2, c22); } else if (c22 == 0) { print(b2, c21); cout<<"don't know"<<endl; } else { cout<<"don't know"<<endl<<"don't know"<<endl; } } else if(c11 * c22 - c12 * c21 == 0) { if(c22 != 0 && (b1/c12 != b2/c22) || c21 == 0 && c22 == 0 && b2 != 0) cout<<"don't know"<<endl<<"don't know"<<endl; else { cout<<"don't know"<<endl; print(b1, c12); } } else { print(c12*b2 - c22 * b1,c21 * c12); print(b1, c12); } } else if (c12 == 0) { if (c11 * c22 - c12 * c21 == 0) { if(c21 != 0 && (b1/c11 != b2/c21) || c21 == 0 && c22 == 0 && b2 != 0) cout<<"don't know"<<endl<<"don't know"<<endl; else { print(b1, c11); cout<<"don't know"<<endl; } } else { print(b1, c11); print(c11*b2 - c21*b1, c22*c11); } } else if (c21 == 0) { if (c22 == 0) { cout<<"don't know"<<endl<<"don't know"<<endl; } else if (c11 * c22 - c12 * c21 == 0) { cout<<"don't know"<<endl; print(b2, c22); } else { print(c22*b1 - c12*b2, c11*c22); print(b2, c22); } } else if (c22 == 0) { if (c11 * c22 - c12 * c21 == 0) { print(b2, c21); cout<<"don't know"<<endl; } else { print(b2, c21); print(c21*b1 - b2*c11, c12*c21); } } else if (c11 * c22 - c12 * c21 == 0) { cout<<"don't know"<<endl<<"don't know"<<endl; } else { print(b1*c22 - b2*c12, c11*c22 - c21*c12); print(c21*b1 - c11*b2, c21*c12 - c11*c22); } } return 0;}
