Solve the Equation $$x \left( x ^ { 2 } + 8 \right) = 3 + x ^ { 3 }$$

Multiple Choice

Solve the equation.
- $$x \left( x ^ { 2 } + 8 \right) = 3 + x ^ { 3 }$$

A) $\left\{ \frac { 3 } { 8 } \right\}$
B) $\{ 3 \}$
C) $\{ 8 \}$
D) $\left\{ \frac { 8 } { 3 } \right\}$