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You can do it with a regular expression.
First, select the books you want to modify.
Edit Metadata -> Edit Metadata in Bulk -> Search and Replace tab.
Search Mode: Regular Expression
Search field: Title
Search for: ^.*?\-.*?\-
Replace with: (leave this field blank)
I can explain the pieces of the regular expression if you want, but if all you're interested in is just getting something that works and you don't care why it works, I'll just leave it at that.
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