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X-3(3X+4)=-12
We move all terms to the left:
X-3(3X+4)-(-12)=0
We add all the numbers together, and all the variables
X-3(3X+4)+12=0
We multiply parentheses
X-9X-12+12=0
We add all the numbers together, and all the variables
-8X=0
X=0/-8
X=0
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