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3(n+2)2=81
We move all terms to the left:
3(n+2)2-(81)=0
We multiply parentheses
6n+12-81=0
We add all the numbers together, and all the variables
6n-69=0
We move all terms containing n to the left, all other terms to the right
6n=69
n=69/6
n=11+1/2
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