Выполните действия: (3b-3c)/c*4c^2/(b^2-c^2).

\[\frac{3b - 3c}{c} \cdot \frac{4c^{2}}{b^{2} - c^{2}} =\]

\[= \frac{3(b - c) \cdot 4c^{2}}{c(b - c)(b + c)} = \frac{12c}{b + c}.\]