19. Let A and B be sets. If AX = BX = and AX = BX for some set X, Show that A= B.

19. Let A and B be sets. If AX = BX = and AX = BX for some set X, Show

1.	19. Let A and B be sets. If AX = BX = and AX = BX for some set X, Show that A= B.
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