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

(-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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