20=40-5s

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Solution for 20=40-5s equation: 



20=40-5s

We move all terms to the left:

20-(40-5s)=0

We add all the numbers together, and all the variables

-(-5s+40)+20=0

We get rid of parentheses

5s-40+20=0

We add all the numbers together, and all the variables

5s-20=0

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

5s=20

s=20/5

s=4

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