Need help deleting duplicate to re-merge

[Clara]

I've already separated two duplicate editions, but need help deleting this one https://www.goodreads.com/book/show/5... so I can re-merge the correct one (https://www.goodreads.com/book/show/5...) back with the others :) Thanks in advance!

[Renske]

They are not duplicates, but both valid editions.