-90=9(-10+a)

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Solution for -90=9(-10+a) equation: 



-90=9(-10+a)

We move all terms to the left:

-90-(9(-10+a))=0

We add all the numbers together, and all the variables

-(9(a-10))-90=0



We calculate terms in parentheses: -(9(a-10)), so:

9(a-10)

We multiply parentheses

9a-90

Back to the equation:

-(9a-90)



We get rid of parentheses

-9a+90-90=0

We add all the numbers together, and all the variables

-9a=0

a=0/-9

a=0

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