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n+(n+1)+(n+2)+(n+3)=54
We move all terms to the left:
n+(n+1)+(n+2)+(n+3)-(54)=0
We get rid of parentheses
n+n+n+n+1+2+3-54=0
We add all the numbers together, and all the variables
4n-48=0
We move all terms containing n to the left, all other terms to the right
4n=48
n=48/4
n=12
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