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Let x>y be two real numbers and z in ...

Let x>y be two real numbers and `z in R`, `z!=0`, Consider the following : 1.`x+z>y+z and xz>yz 2.`x+z>y-z and x-z>y-z 3.xz>yz and x/z>y/z 4.x-z>y-z and x/z>y/z then which are correct:

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