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(3n+3)=15
We move all terms to the left:
(3n+3)-(15)=0
We get rid of parentheses
3n+3-15=0
We add all the numbers together, and all the variables
3n-12=0
We move all terms containing n to the left, all other terms to the right
3n=12
n=12/3
n=4
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