For $y=\frac{x-4}{5x-10}$ and $x\neq 2$, what is the value of $y$ that is not attainable? Express your answer as a common fraction.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
For $y=\frac{x-4}{5x-10}$ and $x\neq 2$, what is the value of $y$ that is not attainable? Express your answer as a common fraction.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac15
For $y=\frac{x-4}{5x-10}$ and $x\neq 2$, what is the value of $y$ that is not attainable? Express your answer as a common fraction.
train