20=-b-4b

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Solution for 20=-b-4b equation: 



20=-b-4b

We move all terms to the left:

20-(-b-4b)=0

We add all the numbers together, and all the variables

-(-5b)+20=0

We get rid of parentheses

5b+20=0

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

5b=-20

b=-20/5

b=-4

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