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x in (-oo:+oo)
(2*b-a)/c = (-1*d)/2 // - (-1*d)/2
(2*b-a)/c-((-1*d)/2) = 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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