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x in (-oo:+oo)
F = (9/4)*(n-27) // - (9/4)*(n-27)
F-((9/4)*(n-27)) = 0
(-9/4)*(n-27)+F = 0
F-9/4*(n-27) = 0
F-9/4*(n-27) = 0
F-9/4*n+243/4 = 0
F-9/4*n+243/4 = 0
x belongs to the empty set
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