Find the multiple of 222, which is not much bigger than 3 190, 222* 15, 222* 16.
Exclude n= 16 abc=358.
2.
1 1 is divisible by 7x+2y-5z, that is, 7x+2y-5z =11k.
3x-7y+ 12z = 14X- 1 1X+4Y- 1Y- 10Z+22Z = 2(7X+2Y-5Z)- 1 1X- 1 1Y+2 * 165438
So it is a multiple of 1 1, that is, 1 1 is divisible by 3x-7y+ 12z.