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234=n+2n+3n
We move all terms to the left:
234-(n+2n+3n)=0
We add all the numbers together, and all the variables
-(+6n)+234=0
We get rid of parentheses
-6n+234=0
We move all terms containing n to the left, all other terms to the right
-6n=-234
n=-234/-6
n=+39
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