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3x-3(4x-3)=-2x-12
We move all terms to the left:
3x-3(4x-3)-(-2x-12)=0
We multiply parentheses
3x-12x-(-2x-12)+9=0
We get rid of parentheses
3x-12x+2x+12+9=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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