in algebra any letter really, however normally it's an x
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A variable
Variable.
x is a variable that represents an unknown number and its value depends on the algebraic expression it is used in.
In mathematics, a variable is a representation, in the form of a letter, of a numerical value. Variables are traditionally used when the value it represents is either unknown or can vary.
A variable is usually used for that - for example, a single letter that represents the unknown quantity.