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x in (-oo:+oo)
F = (7/4)*(n-57) // - (7/4)*(n-57)
F-((7/4)*(n-57)) = 0
(-7/4)*(n-57)+F = 0
F-7/4*(n-57) = 0
F-7/4*(n-57) = 0
F-7/4*n+399/4 = 0
F-7/4*n+399/4 = 0
x belongs to the empty set
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