Find the Limit by Direct Substitution $\lim _ { x \rightarrow - 3 } \left( \frac { 12 x - 10 } { 3 x + 14 } \right)$

Find the limit by direct substitution.
​ $\lim _ { x \rightarrow - 3 } \left( \frac { 12 x - 10 } { 3 x + 14 } \right)$ ​