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Why are the unknowns used in mathematics generally X, Y instead of other letters?
I forgot the source. I read an article a long time ago that in algebra, the first three abc letters of 26 letters are "habitual" as known variables, and the last three letters xyz are "habitual" as unknown variables. As for why it is "three", personally, because our space is "three-dimensional", xyz just constructs a coordinate system, which is intuitive.

Satisfied, please adopt.