$$\frac { 2 } { 4 } ( \frac { - 3 } { 6 } + \frac { 2 } { 7 } )$$
$-\frac{3}{28}\approx -0.107142857$
$$\frac{1}{2}\left(\frac{-3}{6}+\frac{2}{7}\right)$$
$$\frac{1}{2}\left(-\frac{1}{2}+\frac{2}{7}\right)$$
$$\frac{1}{2}\left(-\frac{7}{14}+\frac{4}{14}\right)$$
$$\frac{1}{2}\times \frac{-7+4}{14}$$
$$\frac{1}{2}\left(-\frac{3}{14}\right)$$
$$\frac{1\left(-3\right)}{2\times 14}$$
$$\frac{-3}{28}$$
$$-\frac{3}{28}$$
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$-\frac{3}{28} = -0.10714285714285714$
