$$\frac{1}{2}(-\frac{1}{2}+-\frac{7}{24})$$
$-\frac{19}{48}\approx -0.395833333$
$$\frac{1}{2}\left(-\frac{12}{24}-\frac{7}{24}\right)$$
$$\frac{1}{2}\times \frac{-12-7}{24}$$
$$\frac{1}{2}\left(-\frac{19}{24}\right)$$
$$\frac{1\left(-19\right)}{2\times 24}$$
$$\frac{-19}{48}$$
$$-\frac{19}{48}$$
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$-\frac{19}{48} = -0.3958333333333333$
