1)2x+7=x-1 2) 3(x+5)=x+3. 3)2x-2(2x+3)=x-9

2x+7=x-1x=-1-7x=-8--------------3(x+5)=x+33x+15=x+32x=-12x=-6-----------------2x-2(2x+3)=x-92x-4x-6=x-9-3x=-3x=1==================

1. 2х+7=х-1

2х-х= -7-1

х=-8

2. 3(x+5)= x+3

3x+3*5=x+3

3x-x=-15+3

2x= -12

x= -6

3. 2x-2(2х+3)=х-9

2х-4х+6=х-9

2х-4х-х=6-9

-3х=-3

х=1