$$= 2 \sqrt { 125 x ^ { 2 } z } + 8 x \sqrt { 80 z }$$
$2\sqrt{5}\sqrt{z}\left(5|x|+16x\right)$
$$2\left(5\sqrt{5}\sqrt{x^{2}z}+16\sqrt{z}x\sqrt{5}\right)$$
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$2\sqrt{5z}\left(5|x|+16x\right)$
