$$-\frac{1}{7}\times\frac{2}{3}\times\frac{1}{3}$$
$-\frac{2}{63}\approx -0.031746032$
$$\frac{-2}{7\times 3}\times \frac{1}{3}$$
$$\frac{-2}{21}\times \frac{1}{3}$$
$$-\frac{2}{21}\times \frac{1}{3}$$
$$\frac{-2}{21\times 3}$$
$$\frac{-2}{63}$$
$$-\frac{2}{63}$$
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$-\frac{2}{63} = -0.031746031746031744$