$$2\sqrt[3]{24}-2\sqrt{81}\sqrt{375}$$
$4\sqrt[3]{3}-90\sqrt{15}\approx -342.799502877$
$$2\sqrt[3]{24}-2\times 9\sqrt{375}$$
$$2\sqrt[3]{24}-18\sqrt{375}$$
$$2\sqrt[3]{24}-18\times 5\sqrt{15}$$
$$2\sqrt[3]{24}-90\sqrt{15}$$
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$2 {(2 \sqrt[3]{3} - 45 \sqrt{15})} = -342.799502877$
