Rationalize the denominator: $\frac1{2\sqrt7}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Rationalize the denominator: $\frac1{2\sqrt7}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{\sqrt7}{14}
Rationalize the denominator: $\frac1{2\sqrt7}$.
train