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

$2x+6+\frac{-18}{3-x}$