Tìm x, \( \frac{2}{1.3} + \frac{2}{3.5} + \frac{2}{5.7} + \ldots + \frac{2}{x(x+2)} = \frac{2003}{2004} \)

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c) \( \frac{2}{1.3} + \frac{2}{3.5} + \frac{2}{5.7} + \ldots + \frac{2}{x(x+2)} = \frac{2003}{2004} \)