\(\frac{3}{4} + \left(-\frac{5}{8}\right) + \frac{7}{16} + \left(-\frac{9}{32}\right) = \frac{3\cdot8}{4\cdot8} - \frac{5\cdot4}{8\cdot4} + \frac{7\cdot2}{16\cdot2} - \frac{9}{32} = \frac{24}{32} - \frac{20}{32} + \frac{14}{32} - \frac{9}{32} = \frac{24-20+14-9}{32} = \frac{9}{32}\)