-90=9(b+-9)

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Solution for -90=9(b+-9) equation: 



-90=9(b+-9)

We move all terms to the left:

-90-(9(b+-9))=0

We add all the numbers together, and all the variables

-(9(b-9))-90=0



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

9(b-9)

We multiply parentheses

9b-81

Back to the equation:

-(9b-81)



We get rid of parentheses

-9b+81-90=0

We add all the numbers together, and all the variables

-9b-9=0

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

-9b=9

b=9/-9

b=-1

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