\[\left( \frac{a^{- 3}b^{2}}{2c} \right)^{2} \cdot \frac{(2c)^{3} \cdot a^{6}}{b^{5}} =\]
\[= \frac{a^{- 6}b^{4}}{2²c²} \cdot \frac{2³c³ \cdot a^{6}}{b^{5}} = \frac{2c}{b}\]