-15=3(4+b)

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Solution for -15=3(4+b) equation: 



-15=3(4+b)

We move all terms to the left:

-15-(3(4+b))=0

We add all the numbers together, and all the variables

-(3(b+4))-15=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-12-15=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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