$$\frac{-6}{7}\times10\times(\frac{13}{10}+\frac{7}{5})-\frac{-8}{5}$$
$-\frac{754}{35}\approx -21.542857143$
$$-\frac{6}{7}\times 10\left(\frac{13}{10}+\frac{7}{5}\right)-\frac{-8}{5}$$
$$\frac{-6\times 10}{7}\left(\frac{13}{10}+\frac{7}{5}\right)-\frac{-8}{5}$$
$$\frac{-60}{7}\left(\frac{13}{10}+\frac{7}{5}\right)-\frac{-8}{5}$$
$$-\frac{60}{7}\left(\frac{13}{10}+\frac{7}{5}\right)-\frac{-8}{5}$$
$$-\frac{60}{7}\left(\frac{13}{10}+\frac{14}{10}\right)-\frac{-8}{5}$$
$$-\frac{60}{7}\times \frac{13+14}{10}-\frac{-8}{5}$$
$$-\frac{60}{7}\times \frac{27}{10}-\frac{-8}{5}$$
$$\frac{-60\times 27}{7\times 10}-\frac{-8}{5}$$
$$\frac{-1620}{70}-\frac{-8}{5}$$
$$-\frac{162}{7}-\frac{-8}{5}$$
$$-\frac{162}{7}-\left(-\frac{8}{5}\right)$$
$$-\frac{162}{7}+\frac{8}{5}$$
$$-\frac{810}{35}+\frac{56}{35}$$
$$\frac{-810+56}{35}$$
$$-\frac{754}{35}$$
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$-\frac{754}{35} = -21\frac{19}{35} = -21.542857142857144$
