I'm looking for solution to get colour boxes for equations below (with optional box in one of them) - one for the right and one for the left - as on the picture below.
Is it possible to get dialog boxes (with this little corner)?

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Delfina
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Related: https://tex.stackexchange.com/a/270298/134144 and https://tex.stackexchange.com/a/239511/134144 – leandriis Feb 15 '21 at 19:05