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X-4(X+3)=3X+12
We move all terms to the left:
X-4(X+3)-(3X+12)=0
We multiply parentheses
X-4X-(3X+12)-12=0
We get rid of parentheses
X-4X-3X-12-12=0
We add all the numbers together, and all the variables
-6X-24=0
We move all terms containing X to the left, all other terms to the right
-6X=24
X=24/-6
X=-4
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