$$\frac{ 2 }{ 5 } \sqrt{ 6 } +3 \sqrt{ 6 } - \frac{ 7 }{ 6 } \sqrt{ 6 }$$
$\frac{67\sqrt{6}}{30}\approx 5.470527092$
$$\frac{17}{5}\sqrt{6}-\frac{7}{6}\sqrt{6}$$
$$\frac{67}{30}\sqrt{6}$$
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