12=20-4s

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Solution for 12=20-4s equation: 



12=20-4s

We move all terms to the left:

12-(20-4s)=0

We add all the numbers together, and all the variables

-(-4s+20)+12=0

We get rid of parentheses

4s-20+12=0

We add all the numbers together, and all the variables

4s-8=0

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

4s=8

s=8/4

s=2

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