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3(4x-3)-4=3x-31
We move all terms to the left:
3(4x-3)-4-(3x-31)=0
We multiply parentheses
12x-(3x-31)-9-4=0
We get rid of parentheses
12x-3x+31-9-4=0
We add all the numbers together, and all the variables
9x+18=0
We move all terms containing x to the left, all other terms to the right
9x=-18
x=-18/9
x=-2
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