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d in (-oo:+oo)
(1/2)*d-5*d+7/8 = 17/4 // - 17/4
(1/2)*d-5*d+7/8-(17/4) = 0
(1/2)*d-5*d+7/8-17/4 = 0
-9/2*d-27/8 = 0 // + 27/8
-9/2*d = 27/8 // : -9/2
d = 27/8/(-9/2)
d = -3/4
d = -3/4
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