$${ x }^{ 2 } -5x+15=x(x-3)-14+5(x-2)-10 { x }^{ 2 } =0$$
$\left(x=\frac{7+\sqrt{1511}i}{20}\text{ or }x=\frac{-\sqrt{1511}i+7}{20}\right)\text{ and }\left(x=\frac{-\sqrt{215}i+1}{9}\text{ or }x=\frac{1+\sqrt{215}i}{9}\right)$
