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what is 3x-x

Need Math Help. I want to ask questions about math problems that i don't understood. For example, Equations, Distribute numbers, and Simplify Expressions.

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Caleb M. | Mathematics TutorMathematics Tutor
5.0 5.0 (102 lesson ratings) (102)
3x means you have three x's. Then 3x - x means you have three x's and you take away (subtract) one x. This would leave you with two x's. But we write that as 2x - that is, two x's. Therefore,
3x - x = 2x