<|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
Solve for the target of 172 using only the numbers in the sequence [178, 73, 6, 20], each exactly once, using basic arithmetic operations. You are given a hint to start with the sequence and think of a strategy: "By arranging these numbers unevenly - try to use a subtraction first". Show your working in <think> </think> tags. And return the complete equation as a string including the operator and numbers in <answer> </answer> tags, such as <answer> (a - b) * c + d = 172 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>