-2s-20=-9S-20+7S

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Solution for -2s-20=-9S-20+7S equation: 



-2s-20=-9-20+7

We move all terms to the left:

-2s-20-(-9-20+7)=0

We add all the numbers together, and all the variables

-2s-20-(-22)=0

We add all the numbers together, and all the variables

-2s+2=0

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

-2s=-2

s=-2/-2

s=1

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