Tìm x, biết: \( x = \frac{3}{7} \cdot \frac{9}{14} - \frac{7}{3} \)

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Bài 4: Tìm x, biết:
a) \( x = \frac{3}{7} \cdot \frac{9}{14} - \frac{7}{3} \)
b) \( \left( x - \frac{1}{2} \right) = \frac{3}{11} \cdot \frac{11}{4} \)
c) \( (2x + \frac{3}{8}) = \frac{7}{4} - \frac{21}{32} \)
d) \( x = -\frac{3}{57} \cdot \frac{12}{19} \)