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-(3x-12)=-54
We move all terms to the left:
-(3x-12)-(-54)=0
We add all the numbers together, and all the variables
-(3x-12)+54=0
We get rid of parentheses
-3x+12+54=0
We add all the numbers together, and all the variables
-3x+66=0
We move all terms containing x to the left, all other terms to the right
-3x=-66
x=-66/-3
x=+22
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