Answer
x - $\frac{x + 9}{x^{2} + 1}$
Work Step by Step
$ \hspace{11.5mm}x$
$ x^{2} + 1\overline{)x^{3} - 9}$
$ \hspace{14mm}\underline{x^{3} + x}$
$ \hspace{21mm}-x - 9$
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