a) x * 27 = 459
x = 459 / 27
459 | 27
- 27 | 17
-----
189
- 189
-----
0x = 17
б) 8x + 14 = 870
8x = 870 - 14
8x = 856
x = 856 / 8
856 | 8
- 8 | 107
-----
05
- 0
-----
56
- 56
-----
0x = 107
Ответ: a) 17, б) 107