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2n+(2n+3)=55
We move all terms to the left:
2n+(2n+3)-(55)=0
We get rid of parentheses
2n+2n+3-55=0
We add all the numbers together, and all the variables
4n-52=0
We move all terms containing n to the left, all other terms to the right
4n=52
n=52/4
n=13
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