func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int tc, cs = 1;     scanf( %lld , &tc);     while (tc--) {       long long a, b, c, d;       scanf( %lld %lld , &a, &b);       scanf( %lld %lld , &c, &d);       if ((b - a) % (c + d) == 0)         cout << (b - a) / (c + d) << endl;       else         cout << -1 << endl;     }     return 0;   }   