\[\frac{3}{25}m^{4}c^{9} \cdot ( - 10ma) \cdot 2,5c^{3}a^{6} =\]
\[= - \frac{3}{25} \cdot 25a^{7}c^{12}m^{5} =\]
\[= - 3a^{7}c^{12}m^{5}\]