A line segment has one endpoint at $(3,9)$ and midpoint at $(1,2)$. What is the sum of the coordinates of the other endpoint?
Question:
A line segment has one endpoint at $(3,9)$ and midpoint at $(1,2)$. What is the sum of the coordinates of the other endpoint?
Answer:
Let's think step by step.

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A line segment has one endpoint at $(3,9)$ and midpoint at $(1,2)$. What is the sum of the coordinates of the other endpoint?
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