8X - 7X + 10 = 12
8X - 7X = 12 - 10
X = 2
Проверка
8 * 2 - 7 * 2 + 10 = 12
16 - 14 + 10 = 12
12 = 12
----------------------------
13Y + 15Y - 24 = 60
13Y + 15Y = 60 + 24
28Y = 84
Y = 84 : 28
Y = 3
Проверка
13 * 3 + 15 * 3 - 24 = 60
39 + 45 - 24 = 60
60 = 60
----------------------------
3Z - 2Z + 15 = 32
3Z - 2Z = 32 - 15
Z = 17
Проверка
3 * 17 - 2 * 17 + 15 = 32
51 - 34 + 15 = 32
32 = 32