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3x-3(4x+12)=36
We move all terms to the left:
3x-3(4x+12)-(36)=0
We multiply parentheses
3x-12x-36-36=0
We add all the numbers together, and all the variables
-9x-72=0
We move all terms containing x to the left, all other terms to the right
-9x=72
x=72/-9
x=-8
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