6=21-3s

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Solution for 6=21-3s equation: 



6=21-3s

We move all terms to the left:

6-(21-3s)=0

We add all the numbers together, and all the variables

-(-3s+21)+6=0

We get rid of parentheses

3s-21+6=0

We add all the numbers together, and all the variables

3s-15=0

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

3s=15

s=15/3

s=5

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