9+2s=21

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Solution for 9+2s=21 equation: 



9+2s=21

We move all terms to the left:

9+2s-(21)=0

We add all the numbers together, and all the variables

2s-12=0

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

2s=12

s=12/2

s=6

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