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    LCM and GCD proof.

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    Prove for all positives integers x and y that

    Lcm(5x,7y) = 5* 7 * x*y
    -----------------------
    gcd(x*gcd(5,y),7y)

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    https://brainmass.com/math/discrete-math/lcm-gcd-proof-65113

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    This shows how to work with a proof that relates the LCM and GCD of two numbers.

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