$$\frac{7-2\sqrt{10}}{3}+\frac{7-2\sqrt{10}}{3}$$
$\frac{14-4\sqrt{10}}{3}\approx 0.450296453$
$$\frac{2}{3}\left(7-2\sqrt{10}\right)$$
$$\frac{2}{3}\times 7+\frac{2}{3}\left(-2\right)\sqrt{10}$$
$$\frac{2\times 7}{3}+\frac{2}{3}\left(-2\right)\sqrt{10}$$
$$\frac{14}{3}+\frac{2}{3}\left(-2\right)\sqrt{10}$$
$$\frac{14}{3}+\frac{2\left(-2\right)}{3}\sqrt{10}$$
$$\frac{14}{3}+\frac{-4}{3}\sqrt{10}$$
$$\frac{14}{3}-\frac{4}{3}\sqrt{10}$$
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$\frac{2 {(7 - 2 \sqrt{10})}}{3} = 0.4502964531088273$
