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x in (-oo:+oo)
(2*b-a)/c = (1/2)*d // - (1/2)*d
(2*b-a)/c-((1/2)*d) = 0
(2*b-a)/c+(-1/2)*d = 0
(2*b-a)/c-d/2 = 0
(2*(2*b-a))/(2*c)+(c*(-d))/(2*c) = 0
2*(2*b-a)+c*(-d) = 0
4*b-2*a-(c*d) = 0
(4*b-2*a-(c*d))/(2*c) = 0
(4*b-2*a-(c*d))/(2*c) = 0 // * 2*c
4*b-2*a-(c*d) = 0
x belongs to the empty set
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