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El número que falta lo llamas x
23/8 - x = 17/8
23/8 - 8x/8 = 17/8 Simplificas el 8
23 - 8x = 17
23 - 17 = 8x
6 = 8x
6/8 = x
Respuesta.
El número que falta es 6/8
23/8 - 6/8 = 17/8