-3b+9=-12

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Solution for -3b+9=-12 equation: 



-3b+9=-12

We move all terms to the left:

-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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