$$-\frac{3}{5}\times[\frac{3}{7}+\frac{-5}{6}]$$
$\frac{17}{70}\approx 0.242857143$
$$-\frac{3}{5}\left(\frac{3}{7}-\frac{5}{6}\right)$$
$$-\frac{3}{5}\left(\frac{18}{42}-\frac{35}{42}\right)$$
$$-\frac{3}{5}\times \frac{18-35}{42}$$
$$-\frac{3}{5}\left(-\frac{17}{42}\right)$$
$$\frac{-3\left(-17\right)}{5\times 42}$$
$$\frac{51}{210}$$
$$\frac{17}{70}$$
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$\frac{17}{2 \cdot 5 \cdot 7} = 0.24285714285714285$
