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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra-home/alg-basic-eq-ineq/alg-old-school-equations/v/algebra-linear-equations-1 Equations of the form AX=B Watch the next lesson: https://www.khanacademy.org/math/algebra/solving-linear-equations-and ...
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