Find the Zero of the Linear Function $$G ( x ) = - \frac { 1 } { 3 } x - 7$$

Find the zero of the linear function.
- $$G ( x ) = - \frac { 1 } { 3 } x - 7$$

A) $- \frac { 7 } { 3 }$
B) 21
C) $- 21$
D) $\frac { 7 } { 3 }$