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(9n+12)+(15n-6)=180
We move all terms to the left:
(9n+12)+(15n-6)-(180)=0
We get rid of parentheses
9n+15n+12-6-180=0
We add all the numbers together, and all the variables
24n-174=0
We move all terms containing n to the left, all other terms to the right
24n=174
n=174/24
n=7+1/4
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