You can delete it, or you can use copyscape and change the parts that are duplicates, it's easy.
But personally I think that you and anyone else here should provide unique content. I have written dozens of articles on the exact same topic and with the same message, but they are always different in nature and the angle of writing, so they are not rewrites. I learn the subject and than I can write about it over and over again without the fear of having a duplicate.
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