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3(3n+5)=87
We move all terms to the left:
3(3n+5)-(87)=0
We multiply parentheses
9n+15-87=0
We add all the numbers together, and all the variables
9n-72=0
We move all terms containing n to the left, all other terms to the right
9n=72
n=72/9
n=8
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