There are 25 other letters in the English alphabet. Then why was x particularly selected for this purpose?

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Kevin.....Probably because some genius mathematician, Long ago....thought the X seemed more appropriate than the question mark..????? Obviously, I am not related to that genius........LOL!

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well the premise of the question is false, the other letters are used as placeholders too. in number theory the convention is to use k, l, m, n, p, q for integers. supposedly the tradition of using x started with rene descartes. but algebra predates him, so obviously they were using other symbols before that.

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Because it is, that's way of the world, they same question could have been asked of any use of the other letters if they were used for the same purpose.

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Is it because X marks the spot? so when you've found it then you know where the treasure is?

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I believe the answer is found in the ancient Greek/Roman culture primarily because of their number system; however, I have always loved this solution to this math problem.

The question states: Find X

Here is the equation: 10 = 3X - 2

The answer is X=4; however, the answer I prefer is:

The problem solver simply circles the letter X and declares "Here it is"

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Yes, rather like 2+2. The answer =4. No it isn't, is, it =2+2, but has an element of fourness about it.