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2n+1+2n+1+2n+1=63
We move all terms to the left:
2n+1+2n+1+2n+1-(63)=0
We add all the numbers together, and all the variables
6n-60=0
We move all terms containing n to the left, all other terms to the right
6n=60
n=60/6
n=10
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