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660=12.n
We move all terms to the left:
660-(12.n)=0
We add all the numbers together, and all the variables
-(+12.n)+660=0
We get rid of parentheses
-12.n+660=0
We add all the numbers together, and all the variables
-12n+660=0
We move all terms containing n to the left, all other terms to the right
-12n=-660
n=-660/-12
n=+55
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