-s+7s-2s=20

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



-s+7s-2s=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

4s-20=0

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

4s=20

s=20/4

s=5

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