\[- 5c^{2} \cdot (6 - 4c)\left( 2c^{2} + 7c \right) =\]
\[= \left( - 30c^{2} + 20c^{3} \right)\left( 2c^{2} + 7c \right) =\]
\[= 40c^{5} + 80c^{4} - 210c^{3}\]