Tìm x biết: a) \( x^3 \cdot \left( -\frac{1}{2} \right)^2 = \frac{1}{2}, \) b) \( \frac{14}{9} - (2x+5) = 3^2 \cdot \frac{5}{27} . \)

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10. Tìm x biết: a) \( x^3 \cdot \left( -\frac{1}{2} \right)^2 = \frac{1}{2} ; \)

b) \( \frac{14}{9} - (2x+5) = 3^2 \cdot \frac{5}{27} . \)