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7n=n+15
We move all terms to the left:
7n-(n+15)=0
We get rid of parentheses
7n-n-15=0
We add all the numbers together, and all the variables
6n-15=0
We move all terms containing n to the left, all other terms to the right
6n=15
n=15/6
n=2+1/2
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