is the independent variable that determines the outcome of the function.

is primarily used as an algebraic variable or to represent the horizontal axis in a Cartesian coordinate system. The notation

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On a more theoretical level, the search could be a student looking for algebra worksheets. In algebra, "X" is the hero of the story—the unknown variable that must be solved. A search for "matematik x pdf" might yield cheat sheets, formula lists, and worksheets dedicated to "Solving for X."