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On the set R of real numbers, S is a rel...

On the set R of real numbers, S is a relation defined as
`S={(x,y)//x inR,y inR,x+y=xy}`. Find `a inR` such that 'a' is never the first element of an ordered pair in S. Also find `b inR` such that 'b' is never the second element of an ordered pair in S.

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