$$2^{-3}\times(-7)^{-3}$$
$-\frac{1}{2744}\approx -0.000364431$
$$\frac{1}{8}\left(-7\right)^{-3}$$
$$\frac{1}{8}\left(-\frac{1}{343}\right)$$
$$-\frac{1}{2744}$$
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$-\frac{1}{2744} = -0.00036443148688046647$
