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d in (-oo:+oo)
(5*d)/4-(15/3) = 2*d-(5/4) // - 2*d-(5/4)
(5*d)/4-(2*d)-(15/3)+5/4 = 0
(5*d)/4-2*d+5/4-5 = 0
-3/4*d-15/4 = 0 // + 15/4
-3/4*d = 15/4 // : -3/4
d = 15/4/(-3/4)
d = -5
d = -5
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