-90=-5(a+10)

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Solution for -90=-5(a+10) equation: 



-90=-5(a+10)

We move all terms to the left:

-90-(-5(a+10))=0



We calculate terms in parentheses: -(-5(a+10)), so:

-5(a+10)

We multiply parentheses

-5a-50

Back to the equation:

-(-5a-50)



We get rid of parentheses

5a+50-90=0

We add all the numbers together, and all the variables

5a-40=0

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

5a=40

a=40/5

a=8

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