cf 1374A

#include<stdio.h>

int main()
{
    int t;
    scanf("%d", &t);

    while(t--)
    {
        long long x, y, n;
        scanf("%lld %lld %lld", &x, &y, &n);

        if(n - (n % x) + y <= n) printf("%lld\n", n - (n % x) + y);
        else printf("%lld\n", n - (n % x) + y - x);
    }
}