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2n/3 = 5-3
2n = 2 (3)
2n=6
n=3
La tercera parte = x/3
El doble = 2x
Resolvemos :
2 (x/3) + 3 = 5
2x/3 + 3 = 5
2x/3 = 5 - 3
2x/3 = 2
2x = 2 * 3
2x = 6
x = 6/2
x = 3
Solución : El número es 3