from sys import stdin, exit
input = stdin.readline

def i(): return input()
def ii(): return int(input())
def iis(): return map(int, input().split())
def liis():	return list(map(int, input().split()))
def print_array(a): print(" ".join(map(str, a)))

t = ii()
for _ in range(t):
	x, y, n = iis()	
	a = n//x*x+y
	if a > n:
		a -= x
	print(a)
