-2s-1=21

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Solution for -2s-1=21 equation: 



-2s-1=21

We move all terms to the left:

-2s-1-(21)=0

We add all the numbers together, and all the variables

-2s-22=0

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

-2s=22

s=22/-2

s=-11

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