12=b+3b

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Solution for 12=b+3b equation: 



12=b+3b

We move all terms to the left:

12-(b+3b)=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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