2(s-40)=20

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Solution for 2(s-40)=20 equation: 



2(s-40)=20

We move all terms to the left:

2(s-40)-(20)=0

We multiply parentheses

2s-80-20=0

We add all the numbers together, and all the variables

2s-100=0

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

2s=100

s=100/2

s=50

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