1) 7x + 21 = 2x + 12
7x - 2x = 12 - 21
5x = -9
x = -(9 + 5)
x = -14
2) 8 - 4x = 6x + 28
8 - 28 = 4x + 6x
-20 = 10x
x = -20 ÷ 10
x = -2
1) 7x + 21 = 2x + 12
7x - 2x = 12 - 21
5x = -9
x = -(9 + 5)
x = -14
2) 8 - 4x = 6x + 28
8 - 28 = 4x + 6x
-20 = 10x
x = -20 ÷ 10
x = -2