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-6x+3(4x-4)=-66
We move all terms to the left:
-6x+3(4x-4)-(-66)=0
We add all the numbers together, and all the variables
-6x+3(4x-4)+66=0
We multiply parentheses
-6x+12x-12+66=0
We add all the numbers together, and all the variables
6x+54=0
We move all terms containing x to the left, all other terms to the right
6x=-54
x=-54/6
x=-9
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