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-(3x-12)=15
We move all terms to the left:
-(3x-12)-(15)=0
We get rid of parentheses
-3x+12-15=0
We add all the numbers together, and all the variables
-3x-3=0
We move all terms containing x to the left, all other terms to the right
-3x=3
x=3/-3
x=-1
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