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I finally found a way to use automatic line breaking in long math formulas in LyX from the last post in:


I soon realized (when I was making beamer class presentations) that my formula was numbered in the generated PDF. Is there a way to get rid of this numbering without ERT?

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In the LaTeX preamble, after \usepackage{breqn} and the stuff from the answer I assume you were referring to (not the stuff in the comment), add

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