Solve the Logarithmic Equation $$\log _ { 9 } ( 5 x + 7 ) - \log _ { 9 } x = \log _ { 9 } 6$$

Multiple Choice

Solve the logarithmic equation. $$\log _ { 9 } ( 5 x + 7 ) - \log _ { 9 } x = \log _ { 9 } 6$$

A) $\left\{ - \frac { 7 } { 11 } \right\}$
B) $\left\{ \frac { 7 } { 11 } \right\}$
C) { }
D) $\{ 7 \}$