What is the circumference of the circle defined by $x^2+6x +y^2-12y-4=0$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the circumference of the circle defined by $x^2+6x +y^2-12y-4=0$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
14 \pi
What is the circumference of the circle defined by $x^2+6x +y^2-12y-4=0$?
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