(-12)=(-3b)+9.

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Solution for (-12)=(-3b)+9. equation: 



(-12)=(-3b)+9.

We move all terms to the left:

(-12)-((-3b)+9.)=0

We add all the numbers together, and all the variables

-((-3b)+9.)-12=0



We calculate terms in parentheses: -((-3b)+9.), so:

(-3b)+9.

We add all the numbers together, and all the variables

(-3b)+9

We get rid of parentheses

-3b+9

Back to the equation:

-(-3b+9)



We get rid of parentheses

3b-9-12=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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