Compute the number $\left( \frac{r}{s} \right)^3$ if $r$ and $s$ are non-zero numbers satisfying
\[\frac{1}{r + s} = \frac{1}{r} + \frac{1}{s}.\]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Compute the number $\left( \frac{r}{s} \right)^3$ if $r$ and $s$ are non-zero numbers satisfying
\[\frac{1}{r + s} = \frac{1}{r} + \frac{1}{s}.\]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1
Compute the number $\left( \frac{r}{s} \right)^3$ if $r$ and $s$ are non-zero numbers satisfying
\[\frac{1}{r + s} = \frac{1}{r} + \frac{1}{s}.\]
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