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x in (-oo:+oo)
F = (9/2)*(n-85) // - (9/2)*(n-85)
F-((9/2)*(n-85)) = 0
(-9/2)*(n-85)+F = 0
F-9/2*(n-85) = 0
F-9/2*(n-85) = 0
F-9/2*n+765/2 = 0
F-9/2*n+765/2 = 0
x belongs to the empty set
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