Let a=s-2n,b=3n-s.
Then the answer is (2ab+b)/n.
Try it, you won't regret it!

I saw no one comment, so I would comment myself.
This is so marvelous an editorial.
A thousand thanks to the author(me)!
:-)

Still no one commenting, I guess I'm not a celebrety.
:-(

Sorry for my spelling.

Can I get 50 comments?
Yes, if I do this forever.

You should write it in markdown:
Let $a = s - 2n$, $b = 3n - s$.
Then the answer is $\frac{2ab+b}{n}$.
Try it, you won't regret it!

Try it, you won't regret it!

Edited by author 15.10.2022 12:35

A million thanks to remmymilkyway, the first person other than me to comment!!!!!!!!!!!!1