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x = 1.6
180 rotation
If you mean endpoints of (1, 7) and (3, 3) then the midpoint is at (2, 5).
If endpoint J is at (4, 15) and midpoint L is at (1, 8) then endpoint K is at (-2, 1) Because (4-2)/2 = x and (15+1)/2 = y for midpoint (1, 8)