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3(2n+7)=81
We move all terms to the left:
3(2n+7)-(81)=0
We multiply parentheses
6n+21-81=0
We add all the numbers together, and all the variables
6n-60=0
We move all terms containing n to the left, all other terms to the right
6n=60
n=60/6
n=10
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