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(2n+23)+(3n+17)=180
We move all terms to the left:
(2n+23)+(3n+17)-(180)=0
We get rid of parentheses
2n+3n+23+17-180=0
We add all the numbers together, and all the variables
5n-140=0
We move all terms containing n to the left, all other terms to the right
5n=140
n=140/5
n=28
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