Thực hiện phép tính

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a) \( x + \frac{2}{9} = \frac{1}{2} - \frac{7}{9} \)

b) \( -\frac{13}{15} + x = -\frac{3}{8} - \frac{4}{5} \)

c) \( -\frac{8}{13} + \left( -\frac{7}{5} - x \right) = -\frac{1}{2} \)

d) \( \left( -2 \cdot \frac{1}{4} \cdot (x + 1.5) \right) \left( -\frac{5}{3} \cdot x - \frac{5}{12} \right) = 0. \)