Solve the Equation $$\frac { r } { 3 } + \frac { 6 } { 3 } = \frac { r } { 6 } + \frac { 8 } { 6 }$$

Multiple Choice

Solve the equation.
- $$\frac { r } { 3 } + \frac { 6 } { 3 } = \frac { r } { 6 } + \frac { 8 } { 6 }$$

A) $\{ - 4 \}$
B) $\{ - 12 \}$
C) $\{ 3 \}$
D) $\{ 4 \}$