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180=54+2n+n
We move all terms to the left:
180-(54+2n+n)=0
We add all the numbers together, and all the variables
-(3n+54)+180=0
We get rid of parentheses
-3n-54+180=0
We add all the numbers together, and all the variables
-3n+126=0
We move all terms containing n to the left, all other terms to the right
-3n=-126
n=-126/-3
n=+42
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