\[2\frac{3}{8} \cdot 3\frac{1}{13} + \frac{5}{12} \cdot 3\frac{1}{13} - 3\frac{1}{13} \cdot 1\frac{1}{6} =\]
\[= 3\frac{1}{13} \cdot \left( 2\frac{3^{\backslash 3}}{8} + \frac{5^{\backslash 2}}{12} - 1\frac{1^{\backslash 4}}{6} \right) =\]
\[= \frac{40}{13} \cdot 1\frac{9 + 10 - 4}{24} =\]
\[= \frac{40}{13} \cdot 1\frac{15}{24} = \frac{40 \cdot 39}{13 \cdot 24} = 5\]