$$\frac{8}{9}\div\frac{6}{7}\div\frac{-8}{4}z$$
$-\frac{14z}{27}$
$$\frac{\frac{8}{9}\times 4}{\frac{6}{7}\left(-8\right)}z$$
$$\frac{\frac{8}{9}}{-2\times \frac{6}{7}}z$$
$$\frac{\frac{8}{9}}{\frac{-2\times 6}{7}}z$$
$$\frac{\frac{8}{9}}{\frac{-12}{7}}z$$
$$\frac{\frac{8}{9}}{-\frac{12}{7}}z$$
$$\frac{8}{9}\left(-\frac{7}{12}\right)z$$
$$\frac{8\left(-7\right)}{9\times 12}z$$
$$\frac{-56}{108}z$$
$$-\frac{14}{27}z$$
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$-\frac{14}{27} = -0.5185185185185185$
$$-\frac{14}{27}z^{1-1}$$
$$-\frac{14}{27}z^{0}$$
$$-\frac{14}{27}$$
