\[\frac{m + 4}{5m - 10} + \frac{3 - m}{4m - 8} =\]
\[= \frac{m + 4^{\backslash 4}}{5(m - 2)} + \frac{3 - m^{\backslash 5}}{4(m - 2)} =\]
\[= \frac{4m + 16 + 15 - 5m}{20(m - 2)} =\]
\[= \frac{31 - m}{20m - 40}.\]