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D( n )
-5*n = 0
-5*n = 0
-5*n = 0
-5*n = 0 // : -5
n = 0
n in (-oo:0) U (0:+oo)
(35*n^3-(3*n^2)+25*n)/(-5*n) = 0
(35*n^3-3*n^2+25*n)/(-5*n) = 0
35*n^3-3*n^2+25*n = 0
n*(35*n^2-3*n+25) = 0
35*n^2-3*n+25 = 0
DELTA = (-3)^2-(4*25*35)
DELTA = -3491
DELTA < 0
n = 0
n/(-5*n) = 0
n = 0
n in { 0}
n belongs to the empty set
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