$$-8/7 \times (-7/9) \times (-4/7)$$
$-\frac{32}{63}\approx -0.507936508$
$$-\frac{8}{7}\times \frac{-7}{9}\times \frac{-4}{7}$$
$$-\frac{8}{7}\left(-\frac{7}{9}\right)\times \frac{-4}{7}$$
$$\frac{-8\left(-7\right)}{7\times 9}\times \frac{-4}{7}$$
$$\frac{56}{63}\times \frac{-4}{7}$$
$$\frac{8}{9}\times \frac{-4}{7}$$
$$\frac{8}{9}\left(-\frac{4}{7}\right)$$
$$\frac{8\left(-4\right)}{9\times 7}$$
$$\frac{-32}{63}$$
$$-\frac{32}{63}$$
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$-\frac{32}{63} = -0.5079365079365079$
