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n+(n+2)+(n+3)=57
We move all terms to the left:
n+(n+2)+(n+3)-(57)=0
We get rid of parentheses
n+n+n+2+3-57=0
We add all the numbers together, and all the variables
3n-52=0
We move all terms containing n to the left, all other terms to the right
3n=52
n=52/3
n=17+1/3
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