#include <bits/stdc++.h>   using namespace std;   int main() {     int casos;     cin >> casos;     while (casos > 0) {       int a, b;       cin >> a >> b;       if (a > b) {         int dif = a - b;         b -= dif;         a -= dif * 2;       } else if (b > a) {         int dif = b - a;         a -= dif;         b -= dif * 2;       }       if (a % 3 == 0 && a == b && a >= 0) {         printf( YES n );       } else {         printf( NO n );       }       casos--;     }   }   