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(n+1)*10-2n/2=-91
We move all terms to the left:
(n+1)*10-2n/2-(-91)=0
We add all the numbers together, and all the variables
(n+1)*10-2n/2+91=0
We multiply parentheses
10n-2n/2+10+91=0
We multiply all the terms by the denominator
10n*2-2n+10*2+91*2=0
We add all the numbers together, and all the variables
-2n+10n*2+202=0
Wy multiply elements
-2n+20n+202=0
We add all the numbers together, and all the variables
18n+202=0
We move all terms containing n to the left, all other terms to the right
18n=-202
n=-202/18
n=-11+2/9
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