12=9+3b

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Solution for 12=9+3b equation: 



12=9+3b

We move all terms to the left:

12-(9+3b)=0

We add all the numbers together, and all the variables

-(3b+9)+12=0

We get rid of parentheses

-3b-9+12=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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