\[\boxed{\mathbf{67}\mathbf{.}}\]
\[\frac{c^{\frac{3}{2}}}{c^{\frac{1}{2}} + b^{\frac{1}{2}}} - \frac{cb^{\frac{1}{2}}}{b^{\frac{1}{2}} - c^{\frac{1}{2}}} + \frac{2c^{2} - 4cb}{c - b} =\]
\[= \frac{c^{2} + cb}{c - b} + \frac{2c^{2} - 4cb}{c - b} =\]
\[= \frac{3c^{2} - 3cb}{c - b} = \frac{3c \bullet (c - b)}{c - b} = 3c\]