<|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
Using the numbers [5, 16, 81, 32], create an equation that equals 67. You must use the numbers only once and the only allowed operations are (+, -, *, /). Show your work in <think> </think> tags. And return the final equation and answer in <answer> </answer> tags, for example <answer> 1 + 2 * 3 * 4 = 15 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>