2(a-1)=40

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



2(a-1)=40

We move all terms to the left:

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

We multiply parentheses

2a-2-40=0

We add all the numbers together, and all the variables

2a-42=0

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

2a=42

a=42/2

a=21

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