It is called a variable. x is the most used variable.
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A single element in a mathematical equation is known as a variable. In algebra, a variable is usually a letter, like "X" or "Y," that is solved for.
A term is a single part of an expression or of an equation in algebra.
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It's called a Pro numeral.
In algebra, the letter "p" is typically used as a variable to represent an unknown number. The value of "p" can vary depending on the context of the equation or problem in which it is used. To determine the specific number represented by "p," you would need to solve the equation or problem in which it appears using algebraic methods such as simplifying, isolating the variable, or substituting known values.