12-3b+7=7b+21-2b

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Solution for 12-3b+7=7b+21-2b equation: 



12-3b+7=7b+21-2b

We move all terms to the left:

12-3b+7-(7b+21-2b)=0

We add all the numbers together, and all the variables

-3b-(5b+21)+12+7=0

We add all the numbers together, and all the variables

-3b-(5b+21)+19=0

We get rid of parentheses

-3b-5b-21+19=0

We add all the numbers together, and all the variables

-8b-2=0

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

-8b=2

b=2/-8

b=-1/4

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