Algebra is a branch of mathematics that deals with mathematical symbols and the rules for manipulating these symbols. Algebra is used to study relationships between numbers and quantities and to solve equations.

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Some basic concepts in algebra include variables, expressions, and equations. A variable is a symbol that represents an unknown value, such as x or y. An expression is a combination of numbers and variables, such as 2x + 3. An equation is a statement that two expressions are equal, such as 2x + 3 = 7.