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12=-3n+7n
We move all terms to the left:
12-(-3n+7n)=0
We add all the numbers together, and all the variables
-(+4n)+12=0
We get rid of parentheses
-4n+12=0
We move all terms containing n to the left, all other terms to the right
-4n=-12
n=-12/-4
n=+3
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