12=21-3s

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Solution for 12=21-3s equation: 



12=21-3s

We move all terms to the left:

12-(21-3s)=0

We add all the numbers together, and all the variables

-(-3s+21)+12=0

We get rid of parentheses

3s-21+12=0

We add all the numbers together, and all the variables

3s-9=0

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

3s=9

s=9/3

s=3

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