<|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 [21, 23, 34, 80, 55], create an equation that equals 99. You can use basic arithmetic operations (+, -, *, /) any number of times, but each number can only be used once. Show your work in <think> </think> tags. And return the final equation and answer, in the format <answer> </answer>, for example, <answer> (23 * 2) + 55 = 99 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>