Perform the Subtraction and Simplify $\frac { 2 } { x + 3 } - \frac { 1 } { x ^ { 2 } + 5 x + 6 }$

Perform the subtraction and simplify. $\frac { 2 } { x + 3 } - \frac { 1 } { x ^ { 2 } + 5 x + 6 }$