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El número = x
Los dos novenos del número = 2x/9
x - 2x/9 = 28
9x/9 - 2x/9 = 28
(9x - 2x)/9 = 28
7x/9 = 28
7x = 28 * 9
x = (28 * 9)/7 Simplificas el 7
x = 4 * 9
x = 36
Respuesta.
El número es el 36