$$2 \sqrt{ 6 } -2 \sqrt{ 18 }$$
$2\left(\sqrt{6}-3\sqrt{2}\right)\approx -3.586301889$
$$2\sqrt{6}-2\times 3\sqrt{2}$$
$$2\sqrt{6}-6\sqrt{2}$$
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$2 {(\sqrt{6} - 3 \sqrt{2})} = -3.586301889$
