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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:poly-arithmetic/x2ec2f6f830c9fb89:poly-add-sub/v/adding-and-subtracting-polynomials-1 Simplify (5x^2 + 8x - 3) + (2x^2 - 7x + 13x) Practice this lesson yourself on KhanAcademy.org right now ...
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