Delete a duplicate case study

Hello there!

I hope your week has been great so far.

The second page for the same case study was accidentally created, and I need help removing the old one.

Could you please assist me there?

The old one https://drupal.org/case-study/projekt-magazin (needs to be removed)

The new one for the same project https://www.drupal.org/case-study/projektmagazin (needs to stay in the company's portfolio)

I'm looking forward to your help.

Kind regards,
Anatolii