<|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
Use the numbers [2, 4, 6, 8], and basic arithmetic operations (+, -, *, /), to create a mathematical expression that equals 57. Each number can only be used once. Your expression should show all calculations in <think> </think> tags, and the final answer should be provided in <answer> </answer> tags, for instance like <answer> (2 * 4) + (6 + 8) = 57</answer>. Show your work.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>