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x in (-oo:+oo)
2*a = (6*b-(3*r))/12 // - (6*b-(3*r))/12
2*a-((6*b-(3*r))/12) = 0
2*a-((6*b-3*r)/12) = 0
(-1*(6*b-3*r))/12+2*a = 0
(-1*(6*b-3*r))/12+(2*12*a)/12 = 0
2*12*a-1*(6*b-3*r) = 0
24*a-6*b+3*r = 0
(24*a-6*b+3*r)/12 = 0
(24*a-6*b+3*r)/12 = 0 // * 12
24*a-6*b+3*r = 0
x belongs to the empty set
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