90=-5(5a-8)

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Solution for 90=-5(5a-8) equation: 



90=-5(5a-8)

We move all terms to the left:

90-(-5(5a-8))=0



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

-5(5a-8)

We multiply parentheses

-25a+40

Back to the equation:

-(-25a+40)



We get rid of parentheses

25a-40+90=0

We add all the numbers together, and all the variables

25a+50=0

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

25a=-50

a=-50/25

a=-2

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