Beamer: reveal a multi-line math line-by-line?

[Scott Kostyshak]

Is there a way to not have to use full ERT to reveal a multi-line math
line-by-line? This can be accomplished with LaTeX with the following
solution:

  https://tex.stackexchange.com/questions/60689/uncover-lines-of-an-align-environment-with-beamer

but I don't see how I can avoid doing the full align in ERT. Is there
any other easier LyX-friendly solution?

Scott
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