<|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
Below, you are presented with the numbers [99, 3, 50, 7]. Your task is to solve this as a Countdown puzzle, where the goal is to create an equation that equals 67 using basic arithmetic operations. Each number must be used exactly once. Utilize your best mathematical minds to determine logical steps for the solution. Show your thought processes and the final equation within <think> </think> tags below. Post your solution in the final mark-down form like <answer>99 - 3 - 50 + 7 = ?</answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>