9s-7s-s=20

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Solution for 9s-7s-s=20 equation: 



9s-7s-s=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

s-20=0

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

s=20

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