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x in (-oo:+oo)
D = c*((a+3*b)/2) // - c*((a+3*b)/2)
D-(c*((a+3*b)/2)) = 0
(-1*c*(a+3*b))/2+D = 0
(-1*c*(a+3*b))/2+(2*D)/2 = 0
2*D-1*c*(a+3*b) = 0
2*D-3*b*c-(a*c) = 0
(2*D-3*b*c-(a*c))/2 = 0
(2*D-3*b*c-(a*c))/2 = 0 // * 2
2*D-3*b*c-(a*c) = 0
x belongs to the empty set
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