Verified answer

Ответ:

-21

Пошаговое объяснение:

-2(2,7х - 1) - (6 - 3,4х) + 8(0,4х - 2) =

-5,4х + 2 - 6 + 3,4х + 3,2х - 16 =

(-5,4х + 3,4х + 3,2х) + (2 - 6 - 16) =

1,2х + (-20) = 1,2х - 20

х = -5/6

1,2х - 20 = 1,2 * (-5/6) - 20 = 12/10 * (-5/6) - 20 =

2/2 * (-1/1) - 20 = -2/2 - 20 = -1 - 20 = -21