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(3n+23)+(2n+22)=180
We move all terms to the left:
(3n+23)+(2n+22)-(180)=0
We get rid of parentheses
3n+2n+23+22-180=0
We add all the numbers together, and all the variables
5n-135=0
We move all terms containing n to the left, all other terms to the right
5n=135
n=135/5
n=27
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