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El número es = s
El doble del número es = 2s
La mitad del número es = s/2
Resolvemos:
2s + s/2 = s + 3
(2 * 2s + s)/2 = s + 3
(4s + s)/2 = s + 3
4s + s = 2 (s + 3)
5s = 2s + 6
5s - 2s = 6
3s = 6
s = 6/3
s = 2
Respuesta.
El número es 2