We start with the expression given in the problem:
\[ \frac{x^{r}-r x}{r-\sqrt{x^{r}+r x}} \]
Upon simplification, we find that the expression remains unchanged:
\[ \frac{-r x + x^{r}}{r - \sqrt{r x + x^{r}}} \]
This indicates that the expression does not simplify further under standard algebraic manipulation.
The simplified expression is
\[ \boxed{\frac{-r x + x^{r}}{r - \sqrt{r x + x^{r}}}} \]
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