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x in (-oo:+oo)
F = (7/4)*(n-9) // - (7/4)*(n-9)
F-((7/4)*(n-9)) = 0
(-7/4)*(n-9)+F = 0
F-7/4*(n-9) = 0
F-7/4*(n-9) = 0
F-7/4*n+63/4 = 0
F-7/4*n+63/4 = 0
x belongs to the empty set
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