Make an Appropriate Substitution and Solve the Equation $$( 3 x + 7 ) ^ { 2 } + 2 ( 3 x + 7 ) - 15 = 0$$

Multiple Choice

Make an appropriate substitution and solve the equation.
- $$( 3 x + 7 ) ^ { 2 } + 2 ( 3 x + 7 ) - 15 = 0$$

A) $\left\{ - \frac { 2 } { 3 } , - \frac { 10 } { 3 } \right\}$
B) $\left\{ - 4 , - \frac { 10 } { 3 } \right\}$
C) $\left\{ - 4 , - \frac { 4 } { 3 } \right\}$
D) $\left\{ - \frac { 2 } { 3 } , - \frac { 4 } { 3 } \right\}$