-3b-12=-9

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



-3b-12=-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3b-3=0

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

-3b=3

b=3/-3

b=-1

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