1) 3х - 8 = -х
3х + х = 8
4х = 8
х = 2
2) 2х + 7 = -2х
2х + 2х = -7
4х = -7
х = -7/4 = -1 3/4
3) -х - 2 = 9х
-х - 9х = 2
-10х = 2
х = -2/10 = -1/5 = -0.2
4) -6х - 5 = 4х
-6х - 4х = 5
-10х = 5
х = -5/10 = -1/2 = -0.5
5) -х + 7 = 6х
-х - 6х = -7
-7х = -7
х = 1
6) -7х + 8 = 9х
-7х - 9х = -8
-16х = -8
х = 8/16 = 1/2 = 0.5
