90=-5(-2n-4)

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Solution for 90=-5(-2n-4) equation: 



90=-5(-2n-4)

We move all terms to the left:

90-(-5(-2n-4))=0



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

-5(-2n-4)

We multiply parentheses

10n+20

Back to the equation:

-(10n+20)



We get rid of parentheses

-10n-20+90=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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