Prove that for any integers a and b, if a b and alc, then a|(3b-5c).
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- 20. If and are nonzero integers and is the least common multiple of and prove that.Let ,, and be integers. Prove or disprove that implies or .Let and be positive integers. If and is the least common multiple of and , prove that . Note that it follows that the least common multiple of two positive relatively prime integers is their product.