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x in (-oo:+oo)
F = (9/7)*(n-20) // - (9/7)*(n-20)
F-((9/7)*(n-20)) = 0
(-9/7)*(n-20)+F = 0
F-9/7*(n-20) = 0
F-9/7*(n-20) = 0
F-9/7*n+180/7 = 0
F-9/7*n+180/7 = 0
x belongs to the empty set
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