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n in (-oo:+oo)
(((-5*n)/(-3))/2)*(n-2) = -5 // + 5
(((-5*n)/(-3))/2)*(n-2)+5 = 0
5/6*n*(n-2)+5 = 0
5/6*n*(n-2)+5 = 0
5/6*n^2-5/3*n+5 = 0
5/6*n^2-5/3*n+5 = 0
5*(1/6*n^2-1/3*n+1) = 0
1/6*n^2-1/3*n+1 = 0
DELTA = (-1/3)^2-(1/6*1*4)
DELTA = -5/9
DELTA < 0
5 = 0
5 = 0
n belongs to the empty set
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