12+3b=-b+7b

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Solution for 12+3b=-b+7b equation: 



12+3b=-b+7b

We move all terms to the left:

12+3b-(-b+7b)=0

We add all the numbers together, and all the variables

3b-(+6b)+12=0

We get rid of parentheses

3b-6b+12=0

We add all the numbers together, and all the variables

-3b+12=0

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

-3b=-12

b=-12/-3

b=+4

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