$$-\frac{6}{10}\times(\frac{-3}{4}+\frac{12}{7})$$
$-\frac{81}{140}\approx -0.578571429$
$$-\frac{3}{5}\left(\frac{-3}{4}+\frac{12}{7}\right)$$
$$-\frac{3}{5}\left(-\frac{3}{4}+\frac{12}{7}\right)$$
$$-\frac{3}{5}\left(-\frac{21}{28}+\frac{48}{28}\right)$$
$$-\frac{3}{5}\times \frac{-21+48}{28}$$
$$-\frac{3}{5}\times \frac{27}{28}$$
$$\frac{-3\times 27}{5\times 28}$$
$$\frac{-81}{140}$$
$$-\frac{81}{140}$$
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$-\frac{81}{140} = -0.5785714285714286$