-20-9b=-7b

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



-20-9b=-7b

We move all terms to the left:

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

We get rid of parentheses

-9b+7b-20=0

We add all the numbers together, and all the variables

-2b-20=0

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

-2b=20

b=20/-2

b=-10

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