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