15. Realiza las siguientes operaciones \( \begin{array}{l}\text { (a) }-\frac{1}{3}+\frac{7}{5}-\frac{8}{6} \\ \text { (b) }\left(\frac{4}{3}-\frac{7}{9}\right)-\left(\frac{-9}{15}-\frac{-12}{5}\right) \\ \text { (c) }-\frac{2}{3} \times\left\{\left[\frac{3}{5} \times\left(-\frac{4}{8}\right)\right] \div\left[\frac{3}{7}+\left(-\frac{2}{9}\right)\right]\right\} \\ \text { (d) }\left\{\frac{3}{4} \times\left[\frac{1}{3} \div\left(-\frac{3}{2}\right)\right] \div\left(-\frac{1}{2}+\frac{2}{3}\right)\right. \\ \text { (e) }\left[\left(-\frac{5}{3}+\frac{8}{7}\right) \times\left(-\frac{4}{5}\right)\right] \div\left[-\frac{1}{8} \times\left(-\frac{4}{3} \times \frac{9}{2}\right)\right]\end{array} \)
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