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