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That’s one theory why x is used in math so much: in times of the printing press, the letter x was barely used so always free
yes, if I am not wrong, very early writings used something else, but as printing was becoming common, they wanted to use something from standard typewriter keys, and
xwas a good option (it also helps even the wear out i think)I think they used whole sentences back in the days and it was in the printing press era that they started abbreviating things to letters and symbols
