public static void main ( String [ ] args ) {
  Scanner reader = new Scanner ( System . in ) ;
  int t = reader . nextInt ( ) ;
  while ( t -- != 0 ) {
    long x = reader . nextInt ( ) , y = reader . nextInt ( ) , n = reader . nextInt ( ) ;
    long ans = y ;
    long l = 1 , r = 1000000000 ;
    while ( l <= r ) {
      long mid = ( l + r ) / 2 ;
      if ( mid * x + y <= n ) {
        ans = mid * x + y ;
        l = mid + 1 ;
      }
      else r = mid - 1 ;
    }
    System . out . println ( ans ) ;
  }
}

public static void main ( String [ ] args ) { Scanner reader = new Scanner ( System . in ) ; int t = reader . nextInt ( ) ; while ( t -- != 0 ) { long x = reader . nextInt ( ) , y = reader . nextInt ( ) , n = reader . nextInt ( ) ; long ans = y ; long l = 1 , r = 1000000000 ; while ( l <= r ) { long mid = ( l + r ) / 2 ; if ( mid * x + y <= n ) { ans = mid * x + y ; l = mid + 1 ; } else r = mid - 1 ; } System . out . println ( ans ) ; } }
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