#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>#include <cmath>using namespace std;string st;int a, b, c, d;int cal(string st){ int a; sscanf(st.c_str(), "%d", &a); return a;}void make(string st, int &a, int &b){ if (st == "x") { a++; return; } if (st == "-x") { a--; return; } if (st[st.length() - 1] == 'x') a += cal(st.substr(0, st.length() - 1)); else b += cal(st);}int main(){ int t; scanf("%d", &t); while (t--) { cin >> st; a = b = c = d = 0; int now = 1; int start = 0; while (1) { if (st[now] == '-' || st[now] == '+' || st[now] == '=') { make(st.substr(start, now - start), a, b); start = now; } if (st[now] == '=') break; now++; } now++; start = now; now++; while (1) { if (st[now] == '-' || st[now] == '+' || st[now] == ' ') { make(st.substr(start, now - start), c, d); start = now; } if (st[now] == ' ') break; now++; } a -= c; d -= b; if (a == 0 && d == 0) printf("IDENTITYn"); else if (a == 0 && d != 0) printf("IMPOSSIBLEn"); else printf("%dn",(int)floor(d * 1.0 / a)); } return 0;}
