$$\frac{8}{7}\times\frac{-14}{21}\times\frac{9}{7}$$
$-\frac{48}{49}\approx -0.979591837$
$$\frac{8}{7}\left(-\frac{2}{3}\right)\times \frac{9}{7}$$
$$\frac{8\left(-2\right)}{7\times 3}\times \frac{9}{7}$$
$$\frac{-16}{21}\times \frac{9}{7}$$
$$-\frac{16}{21}\times \frac{9}{7}$$
$$\frac{-16\times 9}{21\times 7}$$
$$\frac{-144}{147}$$
$$-\frac{48}{49}$$
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$-\frac{48}{49} = -0.9795918367346939$
