Answer:
((-9 - 1)/2, (-4 + 6)/2) = (-5,1)
((-5 + x)/2, (1 + y)/2) = (-4,-3)
(-5 + x)/2 = -4
-5 + x = -8
x = -3
(1 + y)/2 = -3
1 + y = -6
y = -7
(-3,-7)
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