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180=4n+25+5n+29
We move all terms to the left:
180-(4n+25+5n+29)=0
We add all the numbers together, and all the variables
-(9n+54)+180=0
We get rid of parentheses
-9n-54+180=0
We add all the numbers together, and all the variables
-9n+126=0
We move all terms containing n to the left, all other terms to the right
-9n=-126
n=-126/-9
n=+14
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