How do I make a "page" a "post" also?

I have an article on my website that is a static homepage. The article is a “page”, not a “post”, so it doesn’t show up under my “recent posts” column on the side of my website. I would like to leave the article as a page so I can have it as a static homepage like it currently is, but, I would also like for this article to show up under my recent posts section as well. I know it’s possible because I have seen sites with it. The only way I can think to do it is to just copy and paste the content of the article in to a post and just name it the same thing. But if I were to do this then I would technically have 2 different web-pages with the same content and I am not too crazy about doing that and also I have yet to do this because I didn’t know if it would effect SEO in anyway. (This article is the main article I am optimizing for). I assume there is an easy way to do this? I am a wordpress noob.

Thanks for any and all responses.