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Algebra uses variables to represent the unknown numeral.
Algebra is the branch of mathematics that uses letters called variables in place of numerals. Algebra is an extremely important foundation of every branch of mathematics.
Algebra
The first branch of mathematics that is taught that uses variables is Algebra. The foundations of algebra touch on every other math course following from trigonometry to advanced calculus.
To have a place to eat and to put your newspaper puzzle flat while you sip tea.