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1/3 - 1/5 = (1×5-3×1)/3×5 = (5-3)/15 = 2/15
3/5 × 3/3 = 3×3/5×3 = 9/15
Luego:
9/15 - 2/15 = (9-2)/15 = 7/15
Respuesta = 7/15