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F = (7/2)*(n-76) // - (7/2)*(n-76)
F-((7/2)*(n-76)) = 0
(-7/2)*(n-76)+F = 0
F-7/2*(n-76) = 0
F-7/2*(n-76) = 0
F-7/2*n+266 = 0
F-7/2*n+266 = 0
x belongs to the empty set
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