2(2b-1)=40

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Solution for 2(2b-1)=40 equation: 



2(2b-1)=40

We move all terms to the left:

2(2b-1)-(40)=0

We multiply parentheses

4b-2-40=0

We add all the numbers together, and all the variables

4b-42=0

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

4b=42

b=42/4

b=10+1/2

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