90=-6(-3-3b)

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Solution for 90=-6(-3-3b) equation: 



90=-6(-3-3b)

We move all terms to the left:

90-(-6(-3-3b))=0

We add all the numbers together, and all the variables

-(-6(-3b-3))+90=0



We calculate terms in parentheses: -(-6(-3b-3)), so:

-6(-3b-3)

We multiply parentheses

18b+18

Back to the equation:

-(18b+18)



We get rid of parentheses

-18b-18+90=0

We add all the numbers together, and all the variables

-18b+72=0

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

-18b=-72

b=-72/-18

b=+4

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