5. Реши уравнения. 30- x = 20 x + 1 = 40 y-8=7

1) 30 - x = 20

x = 30 - 20

x = 10

2) x + 1 = 40

x = 40 - 1

x = 39

3) y - 8 = 7

y = 7 + 8

y = 15

Ответ: x = 10, x = 39, y = 15.