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-3(3x-3)=-99
We move all terms to the left:
-3(3x-3)-(-99)=0
We add all the numbers together, and all the variables
-3(3x-3)+99=0
We multiply parentheses
-9x+9+99=0
We add all the numbers together, and all the variables
-9x+108=0
We move all terms containing x to the left, all other terms to the right
-9x=-108
x=-108/-9
x=+12
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