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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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. One of its endpoints is 
. What is the 
-coordinate of the other endpoint, in terms of 
and/or 
?
; its midpoint is 
. Which of the following gives the 
-coordinate of its other endpoint in terms of 
and 
?