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12=n-
We move all terms to the left:
12-(n-)=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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