3x = 7 - 4x
3x + 4x = 7 - 4x + 4x
7x = 7
7x/7 = 7/7
x = 1
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13-3x = 43 -3x = 43-13 -3x = 30 x = -10
x = -3
If: 3x+8 = 14 Then: 3x = 14-8 So: 3x = 6 Divide both sides by 3: x = 2
3x + 2x = 5x. 5x= (-4) X = (-4)/5 x= -0.8
x+30 = 3x-50 x-3x = -50-30 -2x = -80 x = 40