\[= \left( - \frac{12}{10} - \frac{24 \cdot 1}{10 \cdot 1} \right)\ :\frac{1}{1000} \cdot \frac{3}{10} =\]
\[= \left( - \frac{12}{10} - \frac{24}{10} \right)\ :\frac{1}{1000} \cdot \frac{3}{10} =\]
\[= - \frac{36}{10}\ \cdot \frac{1000}{1} \cdot \frac{3}{10} =\]
\[= - \frac{36 \cdot 1000 \cdot 3}{10 \cdot 10} =\]
\[= - 36 \cdot 10 \cdot 3 = - 1080.\]