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+(N+1)+(N+2)=160
We move all terms to the left:
+(N+1)+(N+2)-(160)=0
We get rid of parentheses
N+N+1+2-160=0
We add all the numbers together, and all the variables
2N-157=0
We move all terms containing N to the left, all other terms to the right
2N=157
N=157/2
N=78+1/2
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