1)
4x + 10(x + 4) = 6(10 - x) + 2x - 2
4x + 10x + 40 = 60 - 6x + 2x - 2
14x + 40 = 58 - 4x
14x + 4x = 58 - 40
18x = 18
x = 1
ответ: 1.
2)
18 + 13(b - 5) + 17 = 4b + 5(6-b) + 10
18 + 13b - 65 + 17 = 4b + 30 - 5b + 10
13b - 30 = -b + 40
13b + b = 40 + 30
14b = 70
b = 5
ответ: 5.
