\[x - 2y = 5;\ \ m = 3:\]
\[\frac{4}{m} + \frac{7}{x - 2y} = \frac{4}{3} + \frac{7}{5} =\]
\[= \frac{4 \cdot 5 + 7 \cdot 3}{15} = \frac{20 + 21}{15} =\]
\[= \frac{41}{15} = 2\frac{11}{15}.\]