<|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
As a challenging task, your goal is to make the number 71 using the numbers [57, -619, 503, 699]. You are allowed to use basic arithmetic operations (+, -, *, /). Each number can only be used once in the equation. Please provide your working and show the final equation in <think> </think> tags, along with the answer in <answer> </answer> tags. Remember to stick to the format, for example: <answer>503 + (699 - 57) = 1155</answer>. Good luck!<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>