12+3b=-20+7b

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Solution for 12+3b=-20+7b equation: 



12+3b=-20+7b

We move all terms to the left:

12+3b-(-20+7b)=0

We add all the numbers together, and all the variables

3b-(7b-20)+12=0

We get rid of parentheses

3b-7b+20+12=0

We add all the numbers together, and all the variables

-4b+32=0

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

-4b=-32

b=-32/-4

b=+8

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