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El número = x
El antecesor del número = x - 1
x - 1 - 7 = 13
x - 8 = 13
x = 13 + 8
x = 21
Respuesta.
El número es el 21
x - 1 = 13+ 7
x - 1 = 20
x = 20 +1
x = 21