$$\frac{52}{4+\sqrt{3}}+4\sqrt{3}$$
$$= \frac{52(4-\sqrt{3})}{(4+\sqrt{3})(4-\sqrt{3})} + 4\sqrt{3}$$
$$= \frac{52(4-\sqrt{3})}{16-3} + 4\sqrt{3} = \frac{52(4-\sqrt{3})}{13} + 4\sqrt{3} = 4(4-\sqrt{3}) + 4\sqrt{3} = 16-4\sqrt{3}+4\sqrt{3} = 16$$