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[tex]n) \: \frac{2}{3} \div ( - \frac{3}{5} ) \\ \\ - \frac{2}{3} \div \frac{3}{5} \\ \\ - \frac{2}{3} \times \frac{5}{3} \\ \\ = - \frac{10}{9} [/tex]

[tex]o) \: - \frac{1}{2} \div ( - \frac{4}{7}) \\ \\ \frac{1}{2} \div \frac{4}{7} \\ \\ \frac{1}{2} \times \frac{7}{4} \\ \\ = \frac{7}{8} [/tex]

[tex]p) \: \frac{1}{7} \div ( - \frac{3}{5} ) \\ \\ - \frac{1}{7} \div \frac{3}{5} \\ \\ - \frac{1}{7} \times \frac{5}{3} \\ \\ = - \frac{5}{21} [/tex]