-89=-2(4+5n)-1

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Solution for -89=-2(4+5n)-1 equation: 



-89=-2(4+5n)-1

We move all terms to the left:

-89-(-2(4+5n)-1)=0

We add all the numbers together, and all the variables

-(-2(5n+4)-1)-89=0



We calculate terms in parentheses: -(-2(5n+4)-1), so:

-2(5n+4)-1

We multiply parentheses

-10n-8-1

We add all the numbers together, and all the variables

-10n-9

Back to the equation:

-(-10n-9)



We get rid of parentheses

10n+9-89=0

We add all the numbers together, and all the variables

10n-80=0

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

10n=80

n=80/10

n=8

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