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3x - 5 + 3x = 1x + 15 3x + 3x -1x = 15 + 5 5x = 20 5x/5 = 20/5 x = 4
-2
15=30-3x 15-30=3x -15=3x -15/3=x -5=x
If: -3x = 15 Then: x = -5 Because: -3 times -5 = 15
3x + 5 = 20 Subtract '5' from both sides 3x = 15 Divide both sides by '3' x = 5 The answer!!!!!