-2s-9-8=-21

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Solution for -2s-9-8=-21 equation: 



-2s-9-8=-21

We move all terms to the left:

-2s-9-8-(-21)=0

We add all the numbers together, and all the variables

-2s+4=0

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

-2s=-4

s=-4/-2

s=+2

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