Z should be negative. For example:
x=2 and y=3 and z=-3 then we have 2<3 so x<y and also -2/3 > -3/3 so x/z > y/z.
x=2 and y=3 and z=-3 then we have 2<3 so x<y and also -2/3 > -3/3 so x/z > y/z.
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