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x in (-oo:+oo)
F = (6/5)*(n-43) // - (6/5)*(n-43)
F-((6/5)*(n-43)) = 0
(-6/5)*(n-43)+F = 0
F-6/5*(n-43) = 0
F-6/5*(n-43) = 0
F-6/5*n+258/5 = 0
F-6/5*n+258/5 = 0
x belongs to the empty set
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