3s-9s=42

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Solution for 3s-9s=42 equation: 



3s-9s=42

We move all terms to the left:

3s-9s-(42)=0

We add all the numbers together, and all the variables

-6s-42=0

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

-6s=42

s=42/-6

s=-7

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