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n+(n+1)+(n+2)+(n+3)=138
We move all terms to the left:
n+(n+1)+(n+2)+(n+3)-(138)=0
We get rid of parentheses
n+n+n+n+1+2+3-138=0
We add all the numbers together, and all the variables
4n-132=0
We move all terms containing n to the left, all other terms to the right
4n=132
n=132/4
n=33
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