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In math, x is a common expression of a variable. Variables are symbols that represent an unknown value. For example, x + 3 = 5 translates to "some value plus three equals 5". In this case x represented the number 2 (x = 2). Sometimes variables represent a more abstract relationship: x + y = 5 translates to "some unknown value plus another unknown value equals 5". In this case there are many possibilities for the values of the variables, like x = 1 and y = 4, or x = 2 and y = 3.

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Q: What is x in math?

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