$$\frac{1}{2}(-\frac{1}{2}+\frac{-1}{12})$$
$-\frac{7}{24}\approx -0.291666667$
$$\frac{1}{2}\left(-\frac{1}{2}-\frac{1}{12}\right)$$
$$\frac{1}{2}\left(-\frac{6}{12}-\frac{1}{12}\right)$$
$$\frac{1}{2}\times \frac{-6-1}{12}$$
$$\frac{1}{2}\left(-\frac{7}{12}\right)$$
$$\frac{1\left(-7\right)}{2\times 12}$$
$$\frac{-7}{24}$$
$$-\frac{7}{24}$$
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$-\frac{7}{24} = -0.2916666666666667$
