(n+1)+(n-1)=20

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Solution for (n+1)+(n-1)=20 equation: 



(n+1)+(n-1)=20

We move all terms to the left:

(n+1)+(n-1)-(20)=0

We get rid of parentheses

n+n+1-1-20=0

We add all the numbers together, and all the variables

2n-20=0

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

2n=20

n=20/2

n=10

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