减去y，相除， 直接求
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#include<bits/stdc++.h>
#include<string.h>
using namespace std;
#define rep(i,j,k) for(LL i=(j); i<(k); ++i)
#define pb push_back
#define PII pair<LL,LL>
#define PLL pair<long long, long long>
#define ini(a,j) memset(a,j,sizeof a)
#define rrep(i,j,k) for(LL i=j; i>=k; --i)
#define fi first
#define se second
#define LL long long
#define beg begin()
#define ed end()
#define all(x) x.begin(),x.end()
int main(int argc, char const *argv[])
{
// #define DEBUG
#ifdef DEBUG
freopen("1.dat","r",stdin);
freopen("ans.dat","w",stdout);
#endif
LL _;
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>_;
while(_--){
LL a,b,c;
cin>>a>>b>>c;
c-=b;
LL d = c/a;
cout<<(d)*a+b<<endl;
}
return 0;
}
#include<bits/stdc++.
