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X = 4X/9 + 3X/5 * 5/9 + 36
X = 20X/45 + 15X/45 +36
X = 4X/9 + 3X/9 +36
X = 7X/9 + 36
Concluimos que 36 es igual a 2X/9
(36/2)*9 = X
18*9 = 162 = X