$$\frac{3-7\sqrt{2}}{5\sqrt{2}}$$
$\frac{3\sqrt{2}}{10}-\frac{7}{5}\approx -0.975735931$
$$\frac{\left(3-7\sqrt{2}\right)\sqrt{2}}{5\left(\sqrt{2}\right)^{2}}$$
$$\frac{\left(3-7\sqrt{2}\right)\sqrt{2}}{5\times 2}$$
$$\frac{\left(3-7\sqrt{2}\right)\sqrt{2}}{10}$$
$$\frac{3\sqrt{2}-7\left(\sqrt{2}\right)^{2}}{10}$$
$$\frac{3\sqrt{2}-7\times 2}{10}$$
$$\frac{3\sqrt{2}-14}{10}$$
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