$$\frac{1}{2}\binom{4}{7}+\binom{3}{-3}$$
$-\frac{5}{7}\approx -0.714285714$
$$\frac{1\times 4}{2\times 7}+\frac{3}{-3}$$
$$\frac{4}{14}+\frac{3}{-3}$$
$$\frac{2}{7}+\frac{3}{-3}$$
$$\frac{2}{7}-1$$
$$\frac{2}{7}-\frac{7}{7}$$
$$\frac{2-7}{7}$$
$$-\frac{5}{7}$$
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$-\frac{5}{7} = -0.7142857142857143$
