Solve $\log _ { 6 } x + \log _ { 6 } ( x - 20 ) = \log _ { 6 } 189$

Multiple Choice

Solve: $\log _ { 6 } x + \log _ { 6 } ( x - 20 ) = \log _ { 6 } 189$

A) {27}
B) {7}
C) $\left\{ \frac { 209 } { 2 } \right\}$
D) no solution