$\begin{array}{l}\phantom{\phantom{;}3x^{2}-4x\phantom{;}+2;}{\phantom{;}3x\phantom{;}-6\phantom{;}\phantom{;}}\\\phantom{;}3x^{2}-4x\phantom{;}+2\overline{\smash{)}\phantom{;}9x^{3}-30x^{2}+30x\phantom{;}-12\phantom{;}\phantom{;}}\\\phantom{\phantom{;}3x^{2}-4x\phantom{;}+2;}\underline{-9x^{3}+12x^{2}-6x\phantom{;}\phantom{-;x^n}}\\\phantom{-9x^{3}+12x^{2}-6x\phantom{;};}-18x^{2}+24x\phantom{;}-12\phantom{;}\phantom{;}\\\phantom{\phantom{;}3x^{2}-4x\phantom{;}+2-;x^n;}\underline{\phantom{;}18x^{2}-24x\phantom{;}+12\phantom{;}\phantom{;}}\\\phantom{;\phantom{;}18x^{2}-24x\phantom{;}+12\phantom{;}\phantom{;}-;x^n;}\\\end{array}$

$3x-6$