9) $$ -\frac{7}{4}\left(-\frac{3}{7}\right)= $$ 10) $$ \left(\frac{5}{6}\right)\left(\frac{6}{5}\right)\left(\frac{3}{5}\right)= $$ 11) $$ \frac{6}{7} \cdot \frac{7}{5} \cdot \frac{7}{6}= $$ 12) $$ \frac{3}{7}\left(\frac{7}{5}\right)\left(\frac{5}{3}\right)= $$ 13) $$ \left(\frac{9}{5}\right)\left(\frac{3}{7}\right)\left(-\frac{5}{9}\right)= $$

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9) $$ -\frac{7}{4}\left(-\frac{3}{7}\right) = \frac{7}{4} \cdot \frac{3}{7} = \frac{7 \cdot 3}{4 \cdot 7} = \frac{3}{4} $$

10) $$ \left(\frac{5}{6}\right)\left(\frac{6}{5}\right)\left(\frac{3}{5}\right) = \frac{5}{6} \cdot \frac{6}{5} \cdot \frac{3}{5} = 1 \cdot \frac{3}{5} = \frac{3}{5} $$

11) $$ \frac{6}{7} \cdot \frac{7}{5} \cdot \frac{7}{6} = \frac{6}{7} \cdot \frac{7}{6} \cdot \frac{7}{5} = 1 \cdot \frac{7}{5} = \frac{7}{5} $$

12) $$ \frac{3}{7}\left(\frac{7}{5}\right)\left(\frac{5}{3}\right) = \frac{3}{7} \cdot \frac{7}{5} \cdot \frac{5}{3} = 1 $$

13) $$ \left(\frac{9}{5}\right)\left(\frac{3}{7}\right)\left(-\frac{5}{9}\right) = \frac{9}{5} \cdot \frac{3}{7} \cdot -\frac{5}{9} = -\frac{3}{7} $$
9) $$ -\frac{7}{4}\left(-\frac{3}{7}\right) = \frac{3}{4} $$ 10) $$ \left(\frac{5}{6}\right)\left(\frac{6}{5}\right)\left(\frac{3}{5}\right) = \frac{3}{5} $$ 11) $$ \frac{6}{7} \cdot \frac{7}{5} \cdot \frac{7}{6} = \frac{7}{5} $$ 12) $$ \frac{3}{7}\left(\frac{7}{5}\right)\left(\frac{5}{3}\right) = 1 $$ 13) $$ \left(\frac{9}{5}\right)\left(\frac{3}{7}\right)\left(-\frac{5}{9}\right) = -\frac{3}{7} $$

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