20-s=-31

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Solution for 20-s=-31 equation: 



20-s=-31

We move all terms to the left:

20-s-(-31)=0

We add all the numbers together, and all the variables

-1s+51=0

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

-s=-51

s=-51/-1

s=+51

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