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(5n-3)+(4n+12)=180
We move all terms to the left:
(5n-3)+(4n+12)-(180)=0
We get rid of parentheses
5n+4n-3+12-180=0
We add all the numbers together, and all the variables
9n-171=0
We move all terms containing n to the left, all other terms to the right
9n=171
n=171/9
n=19
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