8=20-4s

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Solution for 8=20-4s equation: 



8=20-4s

We move all terms to the left:

8-(20-4s)=0

We add all the numbers together, and all the variables

-(-4s+20)+8=0

We get rid of parentheses

4s-20+8=0

We add all the numbers together, and all the variables

4s-12=0

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

4s=12

s=12/4

s=3

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