$$\frac { x ( x + 3 ) } { x ( x + 3 ) } - \frac { x - 4 } { x + 1 } + \frac { 2 x y } { x ^ { 2 } - 8 y }$$
$\frac{5x^{2}+2xy+2yx^{2}-40y}{\left(x+1\right)\left(x^{2}-8y\right)}$
