#include <iostream>#include <cstdio>#include <cstdio>#include <cctype>#include <cstring>using namespace std;int t;char str1[200], str2[200];int a1, b1, c1;int a2, b2, c2;int a3, b3, c3;int a4, b4, c4;int len1, len2;bool issign(char x){return (x=='+'||x=='-');}void solveEqua(char* str, int l, int r, int& a, int& b, int& c){a = b = c = 0;int op = 1;for(int i=l; i<r; i++){if(str[i]==' ') continue;int sign=1, val=1;bool first=1;while(str[i]!=' ' && i<r){if(issign(str[i]) && str[i+1]==' ') op = str[i]=='+'? 1 : -1;if(isdigit(str[i]))//term{if(first){val = str[i]-'0';if(i>0 && issign(str[i-1]))sign = str[i]=='+'? 1 : -1;else sign = 1;first = 0;}else val+=str[i]-'0';if(i+1==r || !isdigit(str[i+1]))first = 1;else val*=10;if(i+1==r || str[i+1]==' ')c += val*sign*op;}if(issign(str[i]) && (str[i+1]=='x' || str[i+1]=='y'))sign = str[i]=='+'? 1 : -1;if(str[i]=='x')a += val*sign*op;else if(str[i]=='y')b += val*sign*op;i++;}}}int findPos(char* str){for(int i=0; i<strlen(str); i++){if(str[i] == '='){return i;}}return -1;}int gcd(int a, int b){if(b==0)return a;return gcd(b, a%b);}int lcm(int a, int b){return a*b/gcd(a, b);}void solve(int a1, int b1, int c1, int a2, int b2, int c2, int& P, int& Q){if(a1==0 && b1==0 && c1!=0)return ;if(a2==0 && b2==0 && c2!=0)return ;if(!b1 && !b2) return;if((!a1 && !b1 && a2 && b2)||( a1 && b1 && !a2 && !b2))return;if(!a1 && !a2 && b1 && b2){if(c1*b2 != c2*b1)return;else{P=b1, Q=-c1;return;}}if(a1 && a2){int L = lcm(a1,a2);P = (b2*L/a2-b1*L/a1);Q = (c1*L/a1)-(c2*L/a2);return;}if(!a1 && b1){P = b1, Q = -c1; return;}if(!a2 && b2){P = b2, Q = -c2; return;}}void printAns(int P, int Q){if(P==0) puts("don't know");else{if(Q%P==0) printf("%dn", Q/P);else{int g = gcd(P, Q);Q=Q/g; P=P/g;if(P<0)Q=-Q, P=-P;printf("%d/%dn", Q, P);}}}int main(){cin>>t;getchar();while(t--){gets(str1); len1 = strlen(str1);gets(str2); len2 = strlen(str2);int pos = findPos(str1);solveEqua(str1, 0, pos, a1, b1, c1);solveEqua(str1, pos+1, len1, a2, b2, c2);pos = findPos(str2);solveEqua(str2, 0, pos, a3, b3, c3);solveEqua(str2, pos+1, len2, a4, b4, c4);int P=0, Q=0;solve(b1-b2, a2-a1, c2-c1, b3-b4, a4-a3, c4-c3, P, Q);printAns(P, Q);P=Q=0;solve(a1-a2, b2-b1, c2-c1,a3-a4, b4-b3, c4-c3, P, Q);printAns(P, Q);if(t!=0) puts("");getchar();}return 0;}
