<|im_start|>system
You are a helpful assistant. You first thinks about the reasoning process in the mind and then provides the user with the answer.<|im_end|>
<|im_start|>user
To get 81 with the numbers 8, 37, 9 and 16, what equation do you make? Use basic arithmetic operations (+, -, * or /) on each number only one time. Write your work in <think> </think> tags. Provide the final equation in <answer> </answer> tags, following this example <answer> (1 + 2) / 3 = 1</answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>