Strangely, three sevens divided by 50 could be just the same (12)
I believe the answer is:
nevertheless
'be just the same' is the definition.
(thesaurus)
'strangely three sevens divided by 50' is the wordplay.
'strangely' indicates an anagram.
'divided by' indicates putting letters inside.
'50' becomes 'l' ('L' can be a synonym of '50').
'three'+'sevens'='threesevens'
'threesevens' is an anagram of 'nevertheess'.
'nevertheess' enclosing 'l' is 'NEVERTHELESS'.
'could' is the link.
(Other definitions for nevertheless that I've seen before include "But always" , "However" , "In spite of everything" , "anyhow" , "Notwithstanding" .)