<|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
You are a part of a secret organization trying to outwit your adversaries in a dangerous Countdown game. The numbers you have been randomly drawn are [12, 45, 30, 81]. Using these numbers and the basic arithmetic operations (+, -, *, /), craft a mathematical equation that equals 67 to gain the advantage in your mission. Show your work in <think> </think> tags, and your final solution must be neatly formatted as <answer> </answer> in the same manner as the example sentence to have it validated by your superiors. Remember, each number can only be used once. Submit your rationale for choosing the equation, explaining the strategic purpose of this move in the context of your mission.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>