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x+2x=x/2 +15
3x=(x+3o)/2
6x-x=30
5x=30
x=6
El numero = x
El doble del numero = 2x
La mitad del numero = x/2
x + 2x = x/2 + 15
x + 2x - x/2 = 15
3x - x/2 = 15
6x/2 - x/2 = 15
(6x - x)/2 = 15
5x/2 = 15
5x = 15*2
5x = 30
x = 30/5
x = 6
Respuesta.
x = 6