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