<|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 [27, 72, 6, 18], create an equation that equals 189. You should attempt to solve this puzzle in multiple ways using your knowledge of basic arithmetic operations (+, -, *, /) and show your work in <think> </think> tags. Please include any techniques or patterns you observe in these attempts so that we can improve our approach. Show the final equation and your solution in <answer> </answer> tags, for example <answer> (3 * 81) - 72 = 189 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>