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3(x-3)=-3x+12
We move all terms to the left:
3(x-3)-(-3x+12)=0
We multiply parentheses
3x-(-3x+12)-9=0
We get rid of parentheses
3x+3x-12-9=0
We add all the numbers together, and all the variables
6x-21=0
We move all terms containing x to the left, all other terms to the right
6x=21
x=21/6
x=3+1/2
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