\[= \left( \frac{25}{16} \cdot \frac{16}{5} + \frac{5}{3} - \frac{9}{1} \cdot \frac{5}{12} \right)\ :11\frac{3}{12} =\]
\[= \left( 5^{\backslash 12} + \frac{5^{\backslash 4}}{3} - \frac{15^{\backslash 3}}{4} \right)\ :11\frac{1}{4} =\]
\[= \frac{60 + 20 - 45}{12}\ :\frac{45}{4} = \frac{35 \cdot 4}{12 \cdot 45} =\]
\[= \frac{7}{27}\]