16) $$\sqrt{32} + \sqrt{18} - 7\sqrt{2} - 3 = \sqrt{16 \cdot 2} + \sqrt{9 \cdot 2} - 7\sqrt{2} - 3 = 4\sqrt{2} + 3\sqrt{2} - 7\sqrt{2} - 3 = (4 + 3 - 7)\sqrt{2} - 3 = 0\sqrt{2} - 3 = -3$$
Ответ: -3