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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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I have provided a flexible solution of using breqn in LyX at:

You can use the starred version of the dmath environment, i.e., dmath* to surround an unnumbered equation which can be created by hitting Ctrl + Shift + M in LyX.

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