7s-3s-s=9

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Solution for 7s-3s-s=9 equation: 



7s-3s-s=9

We move all terms to the left:

7s-3s-s-(9)=0

We add all the numbers together, and all the variables

3s-9=0

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

3s=9

s=9/3

s=3

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