$$7 \sqrt{ 9 } \div 4 \sqrt{ 3 } + \sqrt{ 3 } =$$
$\frac{25\sqrt{3}}{4}\approx 10.825317547$
$$\frac{7\times 3}{4}\sqrt{3}+\sqrt{3}$$
$$\frac{21}{4}\sqrt{3}+\sqrt{3}$$
$$\frac{25}{4}\sqrt{3}$$
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