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6n-15=n+6
We move all terms to the left:
6n-15-(n+6)=0
We get rid of parentheses
6n-n-6-15=0
We add all the numbers together, and all the variables
5n-21=0
We move all terms containing n to the left, all other terms to the right
5n=21
n=21/5
n=4+1/5
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