Solve the Equation $\frac { a } { a + 1 } - 7 = \frac { 8 a } { a + 1 }$

Multiple Choice

Solve the equation. $\frac { a } { a + 1 } - 7 = \frac { 8 a } { a + 1 }$

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