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SEA "X" EL NÚMERO:
X + 2X/3 = 25
5X/3 = 25
5X = 75
X = 15
ESO ES TODO, SALUDOS..........................
El número = x
2/3 del número = 2x/3
x + 2x/3 = 25
3x/3 + 2x/3 = 25
(3x + 2x)/3 = 25
5x/3 = 25
5x = 25 * 3
x = (25 * 3)/5 Simplificas el 5
x = 5 * 3
x = 15
El número es el 15