$$\frac{ { z }^{ 2 } -4zy+4 { z }^{ 2 } }{ { z }^{ 3 } 8 { y }^{ 3 } }$$
$\frac{5}{8zy^{3}}-\frac{1}{2\left(yz\right)^{2}}$
$$\frac{5z^{2}-4zy}{z^{3}\times 8y^{3}}$$
$$\frac{z\left(-4y+5z\right)}{8y^{3}z^{3}}$$
$$\frac{-4y+5z}{8z^{2}y^{3}}$$
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