Solve the Equation $\left( \frac { 1 } { 3 } \right) ^ { 5 x + 2 } = 9 ^ { x - 4 }$

Multiple Choice

Solve the equation.
- $\left( \frac { 1 } { 3 } \right) ^ { 5 x + 2 } = 9 ^ { x - 4 }$

A) $\left\{ \frac { 6 } { 7 } \right\}$
B) $\{ 2 \}$
C) $\left\{ \frac { 2 } { 7 } \right\}$
D) $\left\{ \frac { 1 } { 3 } \right\}$