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d in (-oo:+oo)
(1/2)*d-(2*d)+8 = 13/2 // - 13/2
(1/2)*d-(2*d)-(13/2)+8 = 0
(1/2)*d-2*d-13/2+8 = 0
3/2-3/2*d = 0 // - 3/2
-3/2*d = -3/2 // : -3/2
d = -3/2/(-3/2)
d = 1
d = 1
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