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d in (-oo:+oo)
(1/2)*d-(5*d)+1/2 = 11/4 // - 11/4
(1/2)*d-(5*d)+1/2-(11/4) = 0
(1/2)*d-5*d+1/2-11/4 = 0
-9/2*d-9/4 = 0 // + 9/4
-9/2*d = 9/4 // : -9/2
d = 9/4/(-9/2)
d = -1/2
d = -1/2
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