\[\frac{2 - ab}{2a + ab} + \frac{2b}{2 + b} = \frac{2 - ab}{a(2 + b)} + \frac{2b^{\backslash a}}{2 + b} =\]
\[= \frac{2 - ab + 2ab}{a(2 + b)} = \frac{2 + ab}{2a + ab}\]