3s=20-s

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Solution for 3s=20-s equation: 



3s=20-s

We move all terms to the left:

3s-(20-s)=0

We add all the numbers together, and all the variables

3s-(-1s+20)=0

We get rid of parentheses

3s+1s-20=0

We add all the numbers together, and all the variables

4s-20=0

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

4s=20

s=20/4

s=5

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