РЕШЕНИЕ:
2a−5b+7 = 6 (5a−2b+7)
2a−5b+7 = 30a - 12b + 42
30a - 12b + 42 - 2a + 5b - 7 = 0
28a - 7b + 35 = 0

28a−7b+40 = (28a−7b+35)+5 = 0 + 5 = 5

Ответ: 5

РЕШЕНИЕ:
3a−4b+8 = 9 (4a−3b+8)
3a−4b+8 = 36a - 27b + 72
36a - 27b + 72 - 3a + 4b - 8 = 0
33a - 23b + 64 = 0

33a−23b+71 = (33a−23b+64)+7 = 0 + 7 = 7

Ответ: 7

РЕШЕНИЕ:
a−6b+5 = 7 (6a−b+5)
a−6b+5 = 42a - 7b + 35
42a - 7b + 35 - a + 6b - 5 = 0
41a - b + 30 = 0

41a−b+45 = (41a−b+30)+15 = 0 + 15 = 15

Ответ: 15

РЕШЕНИЕ:
4a−5b+6 = 3 (5a−4b+6)
4a−5b+6 = 15a - 12b + 18
15a - 12b + 18 - 4a + 5b - 6 = 0
11a - 7b + 12 = 0

11a−7b+21 = (11a−7b+12)+9 = 0 + 9 = 9

Ответ: 9