uva 12502 - Three Families

#include<cstdio>
#include<cmath>

int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int x,y,z;
        scanf("%d%d%d",&x,&y,&z);
        //int t=(x+y)/3;
        printf("%d\n",(2*x-y)*z/(x+y));
    }
    return 0;
}