8 - 3x = 128
subtract 8 from each side
-3x = 120
divide each side by -3
x = -40
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If x equals 8, then 3x equals 24. 24-x would equal 16.
3x+8 = 12 3x = 4 x = 4/3
3x - x = 3*8 - 8 = 24 - 8 = 16
3x-6y=-8
3x + 8 = 2x +28 3x - 2x = 28 - 8 x=20