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x in (-oo:+oo)
F = (5/4)*(n-63) // - (5/4)*(n-63)
F-((5/4)*(n-63)) = 0
(-5/4)*(n-63)+F = 0
F-5/4*(n-63) = 0
F-5/4*(n-63) = 0
F-5/4*n+315/4 = 0
F-5/4*n+315/4 = 0
x belongs to the empty set
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