20=-2b+7b

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Solution for 20=-2b+7b equation: 



20=-2b+7b

We move all terms to the left:

20-(-2b+7b)=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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