<|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 [1, 11, 66, 78], create an equation that equals 90. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Remember, your notation should follow PEMDAS/BODMAS rules and provide your Working strategy and the final equation in <think/> tags and return the final equation and answer in console as <answer/> tags. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>