4s-21=3+s

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Solution for 4s-21=3+s equation: 



4s-21=3+s

We move all terms to the left:

4s-21-(3+s)=0

We add all the numbers together, and all the variables

4s-(s+3)-21=0

We get rid of parentheses

4s-s-3-21=0

We add all the numbers together, and all the variables

3s-24=0

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

3s=24

s=24/3

s=8

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