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El número que falta lo llamas x
8/7 + 1 + x = 19/7
8/7 + 7/7 + 7x/7 = 19/7 Simplificas el 7
8 + 7 + 7x = 19
15 + 7x = 19
7x = 19 - 15
7x = 7
x = 4/7
Respuesta.
El número que falta es 4/7