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