<|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 [22, 15, 19, 7], create an equation that equals 64. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think>. And return the final equation and answer in <answer> </answer>. For example: <answer> (4 * 5) + 15 = 35 </answer> would round your solution to the nearest whole number, but please provide the exact solution. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>