func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<long long int> g[100005];   long long int vis[100005];   vector<double> ans;   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long int t = 1;     cin >> t;     while (t--) {       long long int a, b, c, d;       cin >> a >> b >> c >> d;       if ((b - a) % (c + d) == 0)         cout << (b - a) / (c + d);       else         cout << -1;       cout << endl;     }     return 0;   }   