<|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 [20, 17, 5, 8], find an equation that results in 99. You can use basic arithmetic operations such as +, -, *, / in this equation and each number should only be used once. Show your work in <think> </think> tags. And return the final result in <answer> </answer>. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>