<|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 [13, 9, 25, 4], create an equation from using basic arithmetic operations (+, -, *, /) that equals 16. Each number in the list must be used exactly once. Show your work in <think> </think> tags, and return your solution in <answer> </answer> tags, such as <answer> (25 - 9) * 4 = 64 / 4 = 16 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>