Answer :
4(3 - 5) = -2(8 - z) - 6z
4(-2) = -2(8) + 2(z) - 6z
-8 = -16 + 2z - 6z
-8 = -16 - 4z
+ 16 + 16
8 = -4z
-4 -4
-2 = z
4(-2) = -2(8) + 2(z) - 6z
-8 = -16 + 2z - 6z
-8 = -16 - 4z
+ 16 + 16
8 = -4z
-4 -4
-2 = z