<|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, 19, 16, 19], create an equation that equals 151. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags. Then, return the final equation and answer in <answer> </answer> tags. For example, a valid answer could be <answer> 19 * (19 - 15) + 16 = 151 </answer>. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>