<|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 [25, 15, 3, 7], find an equation that equals 100. Use basic arithmetic operations (+, -, *, /) on each number only once. Show your work in <think> </think> tags. Also, return the final equation and its result in <answer> </answer> tags, for example: <answer> 25 * (15 - 3) + 7 = 100 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>