Evaluate $\dfrac{7}{45^2 - 38^2}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Evaluate $\dfrac{7}{45^2 - 38^2}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\dfrac{1}{83}
Evaluate $\dfrac{7}{45^2 - 38^2}$.
train