a) x * 24 = 432
x = 432 / 24
432 | 24
- 24 | 18
-----
192
- 192
-----
0x = 18
б) 7x - 39 = 717
7x = 717 + 39
7x = 756
x = 756 / 7
756 | 7
- 7 | 108
-----
05
- 0
-----
56
- 56
-----
0x = 108
Ответ: a) 18, б) 108