$$6 \sqrt{ 2 } - \frac{ 48 }{ 5 \sqrt{ 2 } } - \frac{ 45 }{ 8 \sqrt{ 2 } }$$
$-\frac{129\sqrt{2}}{80}\approx -2.280419369$
$$6\sqrt{2}-\frac{48\sqrt{2}}{5\left(\sqrt{2}\right)^{2}}-\frac{45}{8\sqrt{2}}$$
$$6\sqrt{2}-\frac{48\sqrt{2}}{5\times 2}-\frac{45}{8\sqrt{2}}$$
$$6\sqrt{2}-\frac{24\sqrt{2}}{5}-\frac{45}{8\sqrt{2}}$$
$$\frac{6}{5}\sqrt{2}-\frac{45}{8\sqrt{2}}$$
$$\frac{6}{5}\sqrt{2}-\frac{45\sqrt{2}}{8\left(\sqrt{2}\right)^{2}}$$
$$\frac{6}{5}\sqrt{2}-\frac{45\sqrt{2}}{8\times 2}$$
$$\frac{6}{5}\sqrt{2}-\frac{45\sqrt{2}}{16}$$
$$-\frac{129}{80}\sqrt{2}$$
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