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(N+1)+(N+2)=93
We move all terms to the left:
(N+1)+(N+2)-(93)=0
We get rid of parentheses
N+N+1+2-93=0
We add all the numbers together, and all the variables
2N-90=0
We move all terms containing N to the left, all other terms to the right
2N=90
N=90/2
N=45
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