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2(2n+1)=n+15+2n
We move all terms to the left:
2(2n+1)-(n+15+2n)=0
We add all the numbers together, and all the variables
2(2n+1)-(3n+15)=0
We multiply parentheses
4n-(3n+15)+2=0
We get rid of parentheses
4n-3n-15+2=0
We add all the numbers together, and all the variables
n-13=0
We move all terms containing n to the left, all other terms to the right
n=13
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