# The power of x occuring in the $7^{th}$ term in the expansion of $\big(\large\frac{4x}{5}-\frac{8}{5x}\big)^9$ is
$\begin{array}{1 1}(A)\;3\\(B)\;-3\\(C)\;\large\frac{160}{27}\\(D)\;\large\frac{80}{3}\end{array}$