<|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 [43, 55, 67, 89], calculate an equation that equals 137. You can utilize basic arithmetic operations (+, -, *, /) and each number can be used only once. Display your equation-solving steps within the <think> tags. Also, provide the final equation and answer in the <answer> tags, formatted like <answer> (1 + 2) * 3 = 6 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>