Math notation on WordPress.com?

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I am a new user with WordPress, and I would like to use mathematical formulas. I have been reading the mathjax pages for hours, such as this one and quite a few others. This may be a bad question, but can someone please help me? All I want to do is enable Latex, and I am hopelessly lost. My most recent attempts have been trying to find the “header file” so that I can copy and paste in 

<script type="text/javascript"
    src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>

I have tried looking for it, and looked over a whole bunch of forum posts about where to find this header file, but I just do not understand. A step by step explanation of how to make mathjax work in the simplest way possible would be extremely appreciated!! (Also, don’t worry about leaving in too many steps!)

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If you have a blog that is hosted on WordPress.com, you can’t install extra plugins or modify the theme files yourself – this is only possible with a self-hosted version.

However, WordPress.com has enabled LaTeX support for everyone. Just write $latex your-latex-code$ and it will be rendered as images.

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