Tìm x: -2x - \(\frac{2}{3}\left(\frac{3}{4} - \frac{1}{8}x\right) = \left(-\frac{1}{2}\right)^{3}\)

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3) -2x - \(\frac{2}{3}\left(\frac{3}{4} - \frac{1}{8}x\right) = \left(-\frac{1}{2}\right)^{3}\)