Two non-zero real numbers, $a$ and $b$, satisfy $ab=a-b$. Find the smallest possible value of: $\frac{a}{b}+\frac{b}{a}-ab$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Two non-zero real numbers, $a$ and $b$, satisfy $ab=a-b$. Find the smallest possible value of: $\frac{a}{b}+\frac{b}{a}-ab$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
Two non-zero real numbers, $a$ and $b$, satisfy $ab=a-b$. Find the smallest possible value of: $\frac{a}{b}+\frac{b}{a}-ab$.
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