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Sea "x" el número, el triple del número es "3x" y su doble "2x", así:
3x = 15 - 2x
3x + 2x = 15
5x = 15
x = 15/5 x = 3
R/ El número es 3. Efectivamente 3x = 3 * 3 = 9 2x = 2 * 3 = 6 y
9 = 15 -6