<|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 [15, 25, 35, 45], create an equation that equals 99. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags. The operation            symbols must be in parentheses and in the correct order. For example <think>(15 + 25) * 3 = 120</think> would not be a valid answer (remember each number can only be used once). Return the final equation and answer in <answer> </answer> tags, for example <answer> (15 * 3) + 25 = 65 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>