How to evaluate an expression with variables | Introduction to algebra | Algebra I | Khan Academy
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How to evaluate an expression with variables | Introduction to algebra | Algebra I | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:intro-variables/v/variables-and-expressions-1 Learn how to evaluate an expression with variables using a technique called substitution (or "plugging in ...
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