A line segment has one endpoint at $(6,8)$ and midpoint at $(1,1)$. What is the sum of the coordinates of the other endpoint?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A line segment has one endpoint at $(6,8)$ and midpoint at $(1,1)$. What is the sum of the coordinates of the other endpoint?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-10
A line segment has one endpoint at $(6,8)$ and midpoint at $(1,1)$. What is the sum of the coordinates of the other endpoint?
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