21-2s=1

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Solution for 21-2s=1 equation: 



21-2s=1

We move all terms to the left:

21-2s-(1)=0

We add all the numbers together, and all the variables

-2s+20=0

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

-2s=-20

s=-20/-2

s=+10

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