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