$$-\frac{6}{7}\times(\frac{-1}{8}+\frac{13}{4})=$$
$-\frac{75}{28}\approx -2.678571429$
$$-\frac{6}{7}\left(-\frac{1}{8}+\frac{13}{4}\right)$$
$$-\frac{6}{7}\left(-\frac{1}{8}+\frac{26}{8}\right)$$
$$-\frac{6}{7}\times \frac{-1+26}{8}$$
$$-\frac{6}{7}\times \frac{25}{8}$$
$$\frac{-6\times 25}{7\times 8}$$
$$\frac{-150}{56}$$
$$-\frac{75}{28}$$
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$-\frac{75}{28} = -2\frac{19}{28} = -2.6785714285714284$