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21n-9=15n+15
We move all terms to the left:
21n-9-(15n+15)=0
We get rid of parentheses
21n-15n-15-9=0
We add all the numbers together, and all the variables
6n-24=0
We move all terms containing n to the left, all other terms to the right
6n=24
n=24/6
n=4
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