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a variable (an unknown number/ any number).
Algebra is a part of mathematics in which letters and other symbols are used to represent numbers and quantities in formulas and equations.
To represent variables you don't know, or could be anything.
algebra? The unknown numbers of which you speak are called variables. "algebra" oxford dictionary definition = investigation of properties of numbers using letters etc as general symbolsAll branches of mathematics have the opportunity to utilize letters instead of numbers. This is called a variable and they are found in every branch of mathematics.
Algebra uses letters to represent unknown numbers.