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2/7 = 12/42
1/3 = 14/42
1/2 = 21/42
1- (2/7 + 1/3 + 1/2) = 42/42 - (12/42 + 14/42 + 21/42)
=42/42-(47/42) = -5/42
Respuesta:
-5/42