Not sure what is easiest. I found that writing Tex equatitions (in Texinfo)
was very easy. Using Open Office equation editor was on the other hand just
pain. Not so long time ago I took a look at Lyx and after fiddling with it
for some time I uninstalled it. Was too confusing to use and did not want to
invest time on learning yet another clickety click editor.
I agree on that thougt that LaTeX makes much more beautiful equatitions than
LibreOffice editor, but not just equations, the document as a whole can look
better.
It takes time to learn to write LaTeX, but it can be worth it if you have to
do many "academical" documents.
