<|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
Taking the number set [18, 22, 60, 25], create a proper equation that results in 72 using basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work by writing steps in <think> </think> tags. Finally, return the final result in <answer> </answer> tags, for example, <answer> 9 * 8 = 72 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>