<|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 [32, 18, -43, 21], create an equation that equals 42. You can utilize the basic arithmetic operations (+, -, *, /) and each number can only be used once. Display your work in <think> </think> tags. Your final answer should be in the form shown in the example provided, with an equation and the answer displayed like <answer> (1 + 5) * 5 = 30 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>