N(n+1)/2=9

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Solution for N(n+1)/2=9 equation: 



(N+1)/2=9

We move all terms to the left:

(N+1)/2-(9)=0

We multiply all the terms by the denominator


(N+1)-9*2=0

We add all the numbers together, and all the variables

(N+1)-18=0

We get rid of parentheses

N+1-18=0

We add all the numbers together, and all the variables

N-17=0

We move all terms containing N to the left, all other terms to the right

N=17

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