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-84+12x=4x+156
We move all terms to the left:
-84+12x-(4x+156)=0
We get rid of parentheses
12x-4x-156-84=0
We add all the numbers together, and all the variables
8x-240=0
We move all terms containing x to the left, all other terms to the right
8x=240
x=240/8
x=30
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