How to leave unique values ​​​​and remove duplicates in Google Spreadsheet?

Question

Google Sheets

There is data in the format 1 2 3 4 5 1 2.
How to remove duplicate values ​​and leave only those for which there were no duplicates (3 4 5)?

Answer 1

https://gdriveru.blogspot.com/2014/11/duplicateval...

Answer 2

There is a great unique formula . But it does not remove the values, but displays only the unique ones from the range.
To remove, you can use a special addon
https://chrome.google.com/webstore/detail/remove-d...