12-3b=-21

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Solution for 12-3b=-21 equation: 



12-3b=-21

We move all terms to the left:

12-3b-(-21)=0

We add all the numbers together, and all the variables

-3b+33=0

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

-3b=-33

b=-33/-3

b=+11

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