9s+3=21

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Solution for 9s+3=21 equation: 



9s+3=21

We move all terms to the left:

9s+3-(21)=0

We add all the numbers together, and all the variables

9s-18=0

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

9s=18

s=18/9

s=2

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