Verified answer

Ответ:

1) -6

Пошаговое объяснение:

1) x + 7 = 1

x = 1 - 7

x = -6

2) x - 5 = 1

x = 1 + 5

x = 6

3) 3 - x = 8

-x = 8 - 3

-x = 5

x = -5

4) 4 + x = 9

x = 9 - 4

x = 5