81=-5-2(-8-5n)

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Solution for 81=-5-2(-8-5n) equation: 



81=-5-2(-8-5n)

We move all terms to the left:

81-(-5-2(-8-5n))=0

We add all the numbers together, and all the variables

-(-5-2(-5n-8))+81=0



We calculate terms in parentheses: -(-5-2(-5n-8)), so:

-5-2(-5n-8)

determiningTheFunctionDomain
-2(-5n-8)-5

We multiply parentheses

10n+16-5

We add all the numbers together, and all the variables

10n+11

Back to the equation:

-(10n+11)



We get rid of parentheses

-10n-11+81=0

We add all the numbers together, and all the variables

-10n+70=0

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

-10n=-70

n=-70/-10

n=+7

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