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Those are letters commonly used for variables. As such, they can stand for any number. A variable may refer to "any number", as in:For any number, call it "x", 2x = x + x

Or for a specific number, which has yet to be found, as in: find the value of "x", such that 2x + 1 = 7 (the solution is 3, in this example).

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โˆ™ 9y ago
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โˆ™ 9y ago

As well as what Hilmar said, if you are thinking of Geometry, these letters are often used to name the three axes in 3D Geometry: X, Y and Z axis.

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Q: What do x y and z mean in math?
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