[tex] - 6 \div \frac{6}{7} = - \frac{6 \times 7}{6} = - 7[/tex]

[tex] \frac{5}{6} \div ( - \frac{5}{12} ) = - \frac{5 \times 12}{6 \times 5} = - \frac{1 \times 2}{1 \times 1} = - 2[/tex]

[tex] - 2 \frac{1}{8} \div ( - 4 \frac{1}{4} ) = \frac{17 \times 4}{8 \times 17} = \frac{ 1\times 1}{2 \times 1} = 0.5[/tex]