$$\frac{10\sqrt{7}}{2\sqrt{3}-4}$$
$-5\sqrt{7}\left(\sqrt{3}+2\right)\approx -49.370391585$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{\left(2\sqrt{3}-4\right)\left(2\sqrt{3}+4\right)}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{\left(2\sqrt{3}\right)^{2}-4^{2}}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{2^{2}\left(\sqrt{3}\right)^{2}-4^{2}}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{4\left(\sqrt{3}\right)^{2}-4^{2}}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{4\times 3-4^{2}}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{12-4^{2}}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{12-16}$$
$$\frac{10\sqrt{7}\left(2\sqrt{3}+4\right)}{-4}$$
$$-\frac{5}{2}\sqrt{7}\left(2\sqrt{3}+4\right)$$
$$-\frac{5}{2}\sqrt{7}\times 2\sqrt{3}-\frac{5}{2}\sqrt{7}\times 4$$
$$-5\sqrt{7}\sqrt{3}-\frac{5}{2}\sqrt{7}\times 4$$
$$-5\sqrt{21}-\frac{5}{2}\sqrt{7}\times 4$$
$$-5\sqrt{21}+\frac{-5\times 4}{2}\sqrt{7}$$
$$-5\sqrt{21}+\frac{-20}{2}\sqrt{7}$$
$$-5\sqrt{21}-10\sqrt{7}$$
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