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X+12=4X-12
We move all terms to the left:
X+12-(4X-12)=0
We get rid of parentheses
X-4X+12+12=0
We add all the numbers together, and all the variables
-3X+24=0
We move all terms containing X to the left, all other terms to the right
-3X=-24
X=-24/-3
X=+8
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