As the others said, your primary focus should always be on good content. SEO will come naturally out of that. Rarely do I go back on articles trying to squeeze in keywords on articles. Sometimes it happens, but most times we just let it go. If you are secured your topic correctly, then there's no needs to focus on keywords as they will appear naturally in your writing.
Also, the subject line irked me and I was almost not going to click on the topic at all. Too often I see "SEO vs Content" where as they actually work together - "SEO *and* Content".
If you write your content correctly, there's nothing to SEO