$\begin{array}{l}\phantom{-5x^{2}+3;}{\phantom{;}2x^{2}\phantom{-;x^n}+\frac{3}{-5}\phantom{;}\phantom{;}}\\-5x^{2}+3\overline{\smash{)}-10x^{4}\phantom{-;x^n}+9x^{2}-4x\phantom{;}+7\phantom{;}\phantom{;}}\\\phantom{-5x^{2}+3;}\underline{\phantom{;}10x^{4}\phantom{-;x^n}-6x^{2}\phantom{-;x^n}\phantom{-;x^n}}\\\phantom{\phantom{;}10x^{4}-6x^{2};}\phantom{;}3x^{2}-4x\phantom{;}+7\phantom{;}\phantom{;}\\\phantom{-5x^{2}+3-;x^n;}\underline{-3x^{2}\phantom{-;x^n}+1.8\phantom{;}\phantom{;}}\\\phantom{;-3x^{2}+1.8\phantom{;}\phantom{;}-;x^n;}-4x\phantom{;}+8.8\phantom{;}\phantom{;}\\\end{array}$

$2x^{2}+\frac{3}{-5}+\frac{-4x+8.8}{-5x^2+3}$