Решение:
\[ 12 - 76 = -64 \]
\[ \left( \frac{-64}{81} : \frac{64}{9} \right) \cdot \frac{9}{37} \]
\[ \frac{-64}{81} \cdot \frac{9}{64} = \frac{-64 \cdot 9}{81 \cdot 64} \]
\[ \frac{-1 \cdot 1}{9 \cdot 1} = -\frac{1}{9} \]
\[ -\frac{1}{9} \cdot \frac{9}{37} = \frac{-1 \cdot 9}{9 \cdot 37} \]
\[ -\frac{1 \cdot 1}{1 \cdot 37} = -\frac{1}{37} \]
Ответ: -1/37