90=3(b+21)

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Solution for 90=3(b+21) equation: 



90=3(b+21)

We move all terms to the left:

90-(3(b+21))=0



We calculate terms in parentheses: -(3(b+21)), so:

3(b+21)

We multiply parentheses

3b+63

Back to the equation:

-(3b+63)



We get rid of parentheses

-3b-63+90=0

We add all the numbers together, and all the variables

-3b+27=0

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

-3b=-27

b=-27/-3

b=+9

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