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x in (-oo:+oo)
F = (4/5)*(n-15) // - (4/5)*(n-15)
F-((4/5)*(n-15)) = 0
(-4/5)*(n-15)+F = 0
F-4/5*(n-15) = 0
F-4/5*(n-15) = 0
F-4/5*n+12 = 0
F-4/5*n+12 = 0
x belongs to the empty set
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