<|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 [17, -8, 7, 31], create an equation that equals 89. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags initially. After that, provide your final answer in <answer> </answer> tags, for example: <answer>(17 - 8) * 7 = 63, after that 63 + 31 = 94 then 94 - 17 = 77, and finally 77 - 8 = 69, which is not 89, you need to find the next step: 17 * 6 = 92, then 92 + (-8) = 84, 84 - 7 = 77, 77 + 31 = 108 - 19 = 89.</answer>. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>