func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int x, y, a, b;       cin >> x >> y >> a >> b;       if ((y - x) % (a + b) != 0) {         cout << -1 << endl;       } else {         cout << (y - x) / (a + b) << endl;       }     }   }   