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El numero = d
d - 1 d + 4
------- = ----------
28 38
38(d - 1) = 28(d + 4)
38d - 38 = 28d + 112
38d - 28d = 112 + 38
10d = 150
d = 150/10
d = 15
Respuesta.
El numero es el 15