Consider the circle defined by the equation $x^2 +6x +y^2 +8y =0$.  Find the sum of the coordinates of the center of the circle.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Consider the circle defined by the equation $x^2 +6x +y^2 +8y =0$.  Find the sum of the coordinates of the center of the circle.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-7
Consider the circle defined by the equation $x^2 +6x +y^2 +8y =0$.  Find the sum of the coordinates of the center of the circle.
train