3s=21+0

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Solution for 3s=21+0 equation: 



3s=21+0

We move all terms to the left:

3s-(21+0)=0

We add all the numbers together, and all the variables

3s-21=0

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

3s=21

s=21/3

s=7

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