Assuming the spaces were unintentional: 129
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3x-4=12 Plus 4 both sides 3x-4+4=12+4 3x=16 divide 3 both sides 3x/3=16/3 x=16/3 x= 5.33
7
3x + 4 = 28Subtract 4 from each side:3x = 24Divide each side by 3:x = 8
3 x 3 x 3 x 3 = 81. 4^3= 64. So no, they are not equal.
if 3x+7 = 3 then 3x = 3-7 3x = -4 then, x = -4/3