90=-2(-5-5n)

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



90=-2(-5-5n)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-2(-5n-5)

We multiply parentheses

10n+10

Back to the equation:

-(10n+10)



We get rid of parentheses

-10n-10+90=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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