If 4 ( 2x5 - 3/2 )3 + 7/5 = 375 then what is the value of x?

Answer: Option C

$$\begin{array}{rl}& \frac{4\left(\frac{2x}{5}-\frac{3}{2}\right)}{3}+\frac{7}{5}=\frac{37}{5}\\ & \Rightarrow \frac{\frac{8x}{5}-6}{3}+\frac{7}{5}=\frac{37}{5}\\ & \Rightarrow 8x-30+21=111\\ & \Rightarrow 8x=111+9\\ & \Rightarrow x=\frac{120}{8}\\ & \Rightarrow x=15\end{array}$$