Verified answer

Ответ:    1) 5(x-4)=x+8

5x-20=x+8

5x-x=8+20

4x=28

x=7

2) 9-7(x+3)=5-6x

9-7x-21=5-6x

-12-7=5-6x

-7x+6x=5+12

x=-17

3) (7x+9)-(11x-7)=8

7x+9-11x+7=8

-4x+16=8

-4x=8-16

-4x=-8

x=2

Пошаговое объяснение:немає ....................................................................................................................................................................................................................................................................................................................................................................................