4x + 4 = - 12
4x = - 12 - 4
4x = - 16
x = - 4
7x - 6 = x + 12
7x - x = 12 + 6
6x = 18
x = 3
(3x - 1) - x = 13
3x - 1 - x = 13
2x - 1 = 13
2x = 13 + 1
2x = 14
x = 7
4x + 4 = - 12
4x = - 12 - 4
4x = - 16
x = - 4
7x - 6 = x + 12
7x - x = 12 + 6
6x = 18
x = 3
(3x - 1) - x = 13
3x - 1 - x = 13
2x - 1 = 13
2x = 13 + 1
2x = 14
x = 7