Tìm `x`: $\dfrac{\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}}{x}=\dfrac{\dfrac{10}{2.5}+\dfrac{10}{5.8}+\dfrac{10}{8.11}+\ ...\ +\dfrac{10}{105.108}}{7}$

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