\left. \begin{array} { l } { x + k } \\ { \frac { x + 2 } { x ^ { 2 } - 16 } + \frac { 4 } { 5 x ^ { 2 } - 19 x - 4 } } \end{array} \right.
Evaluate
x+k,\ \frac{5x^{2}+15x+18}{\left(5x+1\right)\left(x^{2}-16\right)}
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