$\begin{array}{l}\phantom{-x\phantom{;}+3;}{-x\phantom{;}-2\phantom{;}\phantom{;}}\\-x\phantom{;}+3\overline{\smash{)}\phantom{;}x^{2}-x\phantom{;}+12\phantom{;}\phantom{;}}\\\phantom{-x\phantom{;}+3;}\underline{-x^{2}+3x\phantom{;}\phantom{-;x^n}}\\\phantom{-x^{2}+3x\phantom{;};}\phantom{;}2x\phantom{;}+12\phantom{;}\phantom{;}\\\phantom{-x\phantom{;}+3-;x^n;}\underline{-2x\phantom{;}+6\phantom{;}\phantom{;}}\\\phantom{;-2x\phantom{;}+6\phantom{;}\phantom{;}-;x^n;}\phantom{;}18\phantom{;}\phantom{;}\\\end{array}$

$-x-2+\frac{18}{-x+3}$