<|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 [15, 13, 20, 5], create an equation that equals 32. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags. And return your answer in the form of a Python expression. For example, if your final expression is 5 * 4 = 20, your answer should be expressed as (5 * 4) = 20. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>