Tìm x, biết: a) \( x - \frac{3}{7} : \frac{9}{14} = -\frac{7}{3} \) b) \( \left( x - \frac{1}{2} \right) : \frac{3}{11} = \frac{11}{4} \)

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Bài 4: Tìm x, biết:

a) \( x - \frac{3}{7} : \frac{9}{14} = -\frac{7}{3} \)

b) \( \left( x - \frac{1}{2} \right) : \frac{3}{11} = \frac{11}{4} \)