-2+8x=-12 3x-5x=-21+33 5x-3x=15-17 -7x-9x=-40+8 Решите подробно!

-2 + 8х = -128х = -12 +28х = -10х = -10 : 8х = -1,253х - 5х = - 21 + 33- 2х = 12х = 12 : (-2)х = -65х - 3х = 15 - 172х = -2х = -2 : 2х = -1-7х - 9х = -40 + 8-16х = - 32х = -32 : (-16)х = 2