Linq Query - Delete

[shapper]

Hello,

I have 3 tables, Tags, ArticlesTags and FilesTags, with the following
columns:

Tags TagID, Text

ArticlesTags TagID, ArticleID

FilesTags TagID, FileID

I need to delete all records in Tags which are not in ArticlesTags and
FilesTags.

If a Tag is present in one of the 2 tables, ArticlesTags or FilesTags,
then it will not be deleted.

How would I do this?

Thanks,

Miguel