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18=-n+7n
We move all terms to the left:
18-(-n+7n)=0
We add all the numbers together, and all the variables
-(+6n)+18=0
We get rid of parentheses
-6n+18=0
We move all terms containing n to the left, all other terms to the right
-6n=-18
n=-18/-6
n=+3
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