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x in (-oo:+oo)
F = (7/2)*(n-21) // - (7/2)*(n-21)
F-((7/2)*(n-21)) = 0
(-7/2)*(n-21)+F = 0
F-7/2*(n-21) = 0
F-7/2*(n-21) = 0
F-7/2*n+147/2 = 0
F-7/2*n+147/2 = 0
x belongs to the empty set
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