12=-3b-b

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Solution for 12=-3b-b equation: 



12=-3b-b

We move all terms to the left:

12-(-3b-b)=0

We add all the numbers together, and all the variables

-(-4b)+12=0

We get rid of parentheses

4b+12=0

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

4b=-12

b=-12/4

b=-3

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