by a unknown mathmagiacian
x= the unknown
A variable is usually used for that - for example, a single letter that represents the unknown quantity.
The word "variable" represents an unknown number.
x
A variable
A variable.
In mathematical expressions, a variable (a letter used to represent a certain value) represents an unknown or changeable value. It is often the variable x.
a variable
It represents an unknown variable.
a noun
n usually represents and unknown variable