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The answer is variable
A variable
Because, x is a variable, so it can mean any number ever known. It is called the "Unknown Quantity" simply because it represents the number that is not known in the equation. For exampe x+1=y So x and y are variables, each represents a number, if y=2 then it wold be x+1=2 and then you can figure out the "Unknown Quantity" which is 1.
A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
A variable is assigned to represent an unknown quantity.