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midpoint = (2, 8)
coordinate a = (10. 12)
let coordinate b = (x, y)
Find x:
0.5(10 + x) = 2
10 + x = 4
x = 4 - 10
x = -6
Find y:
0.5(12 + y) = 8
12 + y = 16
y = 16 - 12
y = 4
Answer: Coordinate b = (-6, 4)
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