One Root of the Equation $x \left( 3 x ^ { 3 } - 2 \right) = 7 x$

Multiple Choice

One root of the equation $x \left( 3 x ^ { 3 } - 2 \right) = 7 x$ is 0 . How many other roots are there?

A) 4
B) none of these
C) 3
$\begin{array} { l l } \text { d. } & 2 \\ \text { e. } & 0 \end{array}$