Variable, A symbol (x, y, a) that represents an unknown or changing value. A symbol (x, y, a) that represents an unknown or changing value.  A symbol that represents an unknown or changing value., Constant , A fixed value that does not change., Numerical Coefficient , The number multiplied by the variable in a term., Literal Coefficient , The variable part of a term. In 5x2, it is x2., Algebraic Expression , A mathematical phrase with variables, constants, and operations..

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