-9=3(b+4)

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Solution for -9=3(b+4) equation: 



-9=3(b+4)

We move all terms to the left:

-9-(3(b+4))=0



We calculate terms in parentheses: -(3(b+4)), so:

3(b+4)

We multiply parentheses

3b+12

Back to the equation:

-(3b+12)



We get rid of parentheses

-3b-12-9=0

We add all the numbers together, and all the variables

-3b-21=0

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

-3b=21

b=21/-3

b=-7

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