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X/3 = Tercera parte
4(X/3) = 4X/3 => Cuadruple de la tercera parte
X/9 = Novena parte
(4X/3) + (X/9) = 13
(4X/3) + (X/9) = [3(4X) + X]/9 = [12X + X]/9 = 13X/9
13X/9 = 13
13X = 13(9)
X = [13(9)]/[13] = X = 9
X = 9
3X = 3(9) = 27