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144=n+11n
We move all terms to the left:
144-(n+11n)=0
We add all the numbers together, and all the variables
-(+12n)+144=0
We get rid of parentheses
-12n+144=0
We move all terms containing n to the left, all other terms to the right
-12n=-144
n=-144/-12
n=+12
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