I found the answer about how to delete a tweet you've posted but not how to delete a retweet in Tweetdeck web version.
How to delete a retweet in Tweetdeck web version
deleteretweettweetdeck
Related Solutions
TweetDeck uses Deck.ly to allow users to write tweets longer than 140 characters. The problem you experience is because Deck.ly does not work as expected. Deck.ly is a service of TweetDeck (if you try to open deck.ly from your browser, it redirects to tweetdeck.com). You cannot change it from TweetDeck settings, but you can disable it. Just uncheck the following option in settings:
Furthermore, I recommend you reading the following article: If you can’t say it in 140 characters, say it elsewhere.
Click the right-most icon -
And I hope @Newsweek is your own account. Or else you cannot delete the tweet.
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Best Answer
Use "Undo Retweet" item at the very bottom of the context menu displayed when you click on the three dots at the bottom right of a tweet:
(Perhaps counterintuitively, clicking the green "retweeted" button does not offer an option to undo the retweet).