$$16 { z }^{ 3 } +20 { z }^{ 2 } -4 { z }^{ 4 } +12 { z }^{ 5 }$$
$4z^{2}\left(3z^{3}-z^{2}+4z+5\right)$
$$4\left(4z^{3}+5z^{2}-z^{4}+3z^{5}\right)$$
$$z^{2}\left(4z+5-z^{2}+3z^{3}\right)$$
$$4z^{2}\left(4z+5-z^{2}+3z^{3}\right)$$
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