-3b+20-9b=-20-7b

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Solution for -3b+20-9b=-20-7b equation: 



-3b+20-9b=-20-7b

We move all terms to the left:

-3b+20-9b-(-20-7b)=0

We add all the numbers together, and all the variables

-3b-9b-(-7b-20)+20=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-12b+7b+20+20=0

We add all the numbers together, and all the variables

-5b+40=0

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

-5b=-40

b=-40/-5

b=+8

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