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"...the police press "play" and listen to it..." "...-''my life is a mess,I can't take it'' then they hear a gunshot" The policeman must have asked himself who had turned off the tape recorder than?

1/0 or 0/0 or some other forms are meaningless without specification of their origins (functions).These,generally written as here, are not numbers and sign "=" becomes meaningless for comparations.