2(-7b)+4b=-20

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Solution for 2(-7b)+4b=-20 equation: 



2(-7b)+4b=-20

We move all terms to the left:

2(-7b)+4b-(-20)=0

We add all the numbers together, and all the variables

4b+2(-7b)+20=0

We multiply parentheses

4b-14b+20=0

We add all the numbers together, and all the variables

-10b+20=0

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

-10b=-20

b=-20/-10

b=+2

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