Verified answer

Ответ:

1)

-x = 7

x = 7

2)

|x|=-0.27

x = ∅

3)

2|x|=8.4

|x|=4.2

x = -4.2; 4.2

Конечные ответы:

1) 7

2) ∅

3) -4.2 и 4.2