$$\frac { x ^ { 4 } + 7 x + 10 \cdot \frac { 6 x - 6 } { x ^ { 2 } + 2 x - 15 } } { x ^ { 2 } + 2 x - 15 }$$
$\frac{x^{6}+2x^{5}-15x^{4}+7x^{3}+14x^{2}-45x-60}{\left(\left(x-3\right)\left(x+5\right)\right)^{2}}$
$\frac{x^{6}+2x^{5}-15x^{4}+7x^{3}+14x^{2}-45x-60}{\left(x^{2}+2x-15\right)^{2}}$
