Final answer:
A variable in mathematics represents an unknown or changing value in an equation or expression.
Step-by-step explanation:
A variable in mathematics refers to a letter or symbol that represents an unknown value. It is typically used in algebraic expressions or equations to represent an unknown quantity or a changing quantity. For example, in the equation 3x + 2 = 8, 'x' is a variable that can take on different values to satisfy the equation.
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