-81=21+(n-1)-3

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Solution for -81=21+(n-1)-3 equation: 



-81=21+(n-1)-3

We move all terms to the left:

-81-(21+(n-1)-3)=0



We calculate terms in parentheses: -(21+(n-1)-3), so:

21+(n-1)-3

determiningTheFunctionDomain
(n-1)+21-3

We add all the numbers together, and all the variables

(n-1)+18

We get rid of parentheses

n-1+18

We add all the numbers together, and all the variables

n+17

Back to the equation:

-(n+17)



We get rid of parentheses

-n-17-81=0

We add all the numbers together, and all the variables

-1n-98=0

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

-n=98

n=98/-1

n=-98

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