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An "expression" is anything that can be evaluated into a number. That includes variables; if you replace them with values, you can get a number. Here are some example:

5 (numbers themselves are expressions)

x (a simple variable)

5+3 (a sum)

x+3 (a sum involving variables)

3y (a product involving variables)

5x2 + 3x - 2 (a polynomial)

sin(x) (a mathematical function)

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Q: Could you please give me an example of a math expression?
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