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d in (-oo:+oo)
(1/2)*d-(5*d)-6 = -75/8 // + -75/8
(1/2)*d-(5*d)-(-75/8)-6 = 0
(1/2)*d-5*d+75/8-6 = 0
27/8-9/2*d = 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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