$$\frac{5}{7}\div\frac{10}{21}\frac{1}{\frac{5}{7}}\times\frac{-24}{18}$$
$-\frac{14}{5}=-2.8$
$$\frac{5}{7}\times \frac{21}{10}\times \frac{1}{\frac{5}{7}}\times \frac{-24}{18}$$
$$\frac{5\times 21}{7\times 10}\times \frac{1}{\frac{5}{7}}\times \frac{-24}{18}$$
$$\frac{105}{70}\times \frac{1}{\frac{5}{7}}\times \frac{-24}{18}$$
$$\frac{3}{2}\times \frac{1}{\frac{5}{7}}\times \frac{-24}{18}$$
$$\frac{3}{2}\times 1\times \frac{7}{5}\times \frac{-24}{18}$$
$$\frac{3}{2}\times \frac{7}{5}\times \frac{-24}{18}$$
$$\frac{3\times 7}{2\times 5}\times \frac{-24}{18}$$
$$\frac{21}{10}\times \frac{-24}{18}$$
$$\frac{21}{10}\left(-\frac{4}{3}\right)$$
$$\frac{21\left(-4\right)}{10\times 3}$$
$$\frac{-84}{30}$$
$$-\frac{14}{5}$$
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$-\frac{14}{5} = -2\frac{4}{5} = -2.8$
