Let x, y, and z be integers. If zly and ylz, then ra
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- 20. If and are nonzero integers and is the least common multiple of and prove that.13. Let Z denote the set of all integers, and let Prove that .[Type here] 7. Let be the set of all ordered pairs of integers and . Equality, addition, and multiplication are defined as follows: if and only if and in , Given that is a ring, determine whether is commutative and whether has a unity. Justify your decisions. [Type here]