[Question] Plagiarism & Unique Articles

Hello, i have a question about plagiarism. Since Search Engines like unique content, let's say that i write an article which is 80%-90% Unique. And let's say someone comes to my blog, copy past my content and put it in his blog. Now my content is not unique anymore since it has been doubled. So what am i supposed to do? Rewrite the article? Or this won't affect anything? Thanks.

Can someone help?

You don't need to rewrite anything. Google indexed your article first, so he knows that you are the original author.

Make sure you get your article indexed as fast as possible
So that you are the 1st the search engines see

No need to rewrite yours. If you published yours and it got indexed first, the one who copied your work is in trouble and not you.