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x in (-oo:+oo)
4*c = (a-b)/3 // - (a-b)/3
4*c-((a-b)/3) = 0
(-1*(a-b))/3+4*c = 0
(-1*(a-b))/3+(3*4*c)/3 = 0
3*4*c-1*(a-b) = 0
b-a+12*c = 0
(b-a+12*c)/3 = 0
(b-a+12*c)/3 = 0 // * 3
b-a+12*c = 0
x belongs to the empty set
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