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x in (-oo:+oo)
F = (8/5)*(n-27) // - (8/5)*(n-27)
F-((8/5)*(n-27)) = 0
(-8/5)*(n-27)+F = 0
F-8/5*(n-27) = 0
F-8/5*(n-27) = 0
F-8/5*n+216/5 = 0
F-8/5*n+216/5 = 0
x belongs to the empty set
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