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