\[\frac{3^{\backslash a + 5}}{a} + \frac{a - 3^{\backslash a}}{a + 5} = \frac{3a + 15 + a^{2} - 3a}{a(a + 5)} =\]
\[= \frac{a^{2} + 15}{a^{2} + 5a}\]