2*(b-4)=20

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



2(b-4)=20

We move all terms to the left:

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

We multiply parentheses

2b-8-20=0

We add all the numbers together, and all the variables

2b-28=0

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

2b=28

b=28/2

b=14

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