$$\frac{-2\sqrt{6}}{\sqrt{7}}$$
$-\frac{2\sqrt{42}}{7}\approx -1.8516402$
$$\frac{-2\sqrt{6}\sqrt{7}}{\left(\sqrt{7}\right)^{2}}$$
$$\frac{-2\sqrt{6}\sqrt{7}}{7}$$
$$\frac{-2\sqrt{42}}{7}$$
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