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