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(2n+1)+(2n+3)+(2n+5)=63
We move all terms to the left:
(2n+1)+(2n+3)+(2n+5)-(63)=0
We get rid of parentheses
2n+2n+2n+1+3+5-63=0
We add all the numbers together, and all the variables
6n-54=0
We move all terms containing n to the left, all other terms to the right
6n=54
n=54/6
n=9
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