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d in (-oo:+oo)
(1/2)*(4-8*d)+6 = 0
1/2*(4-8*d)+6 = 0
1/2*(4-8*d)+6 = 0
8-4*d = 0
8-4*d = 0
8-4*d = 0 // - 8
-4*d = -8 // : -4
d = -8/(-4)
d = 2
d = 2
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