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