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-(x+6)-3=12
We move all terms to the left:
-(x+6)-3-(12)=0
We add all the numbers together, and all the variables
-(x+6)-15=0
We get rid of parentheses
-x-6-15=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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