$$2\frac{1}{3}x - 1\frac{1}{2}x + \frac{1}{6}x = \frac{7}{3}x - \frac{3}{2}x + \frac{1}{6}x = \frac{7\cdot2 - 3\cdot3 + 1}{6}x = \frac{14-9+1}{6}x = \frac{6}{6}x = x$$
Ответ: $$x$$