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x in (-oo:+oo)
F = (1/2)*(r+6.5) // - (1/2)*(r+6.5)
F-((1/2)*(r+6.5)) = 0
(-1/2)*(r+6.5)+F = 0
F-1/2*(r+6.5) = 0
F-1/2*(r+6.5) = 0
F-1/2*r-3.25 = 0
F-1/2*r-3.25 = 0
x belongs to the empty set
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