\( \Large x^{-2/3} \) =\( \Large \frac{1}{4} \) \( \Large x^{2/3} \) = 4 \( \Large \sqrt[3]{x^2}\) = 4 \( \Large x^2 \) = \(4^3 \) = 64 x=8 2x = \( \Large 8 \times 2 \) = 16