Find the Solution Set for the Equation $$| 7 x + 6 | + 9 = 13$$

Multiple Choice

Find the solution set for the equation.
- $$| 7 x + 6 | + 9 = 13$$

A) $\left\{ - \frac { 1 } { 3 } , - \frac { 5 } { 3 } \right\}$
B) $\left\{ \frac { 2 } { 7 } , \frac { 10 } { 7 } \right\}$
C) $\varnothing$
D) $\left\{ - \frac { 2 } { 7 } , - \frac { 10 } { 7 } \right\}$