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-(12x+3)=57
We move all terms to the left:
-(12x+3)-(57)=0
We get rid of parentheses
-12x-3-57=0
We add all the numbers together, and all the variables
-12x-60=0
We move all terms containing x to the left, all other terms to the right
-12x=60
x=60/-12
x=-5
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