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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = n/24 // - n/24
6/n-(n/24) = 0
6*n^-1-1/24*n^1 = 0
(6*n^0-1/24*n^2)/(n^1) = 0 // * n^2
n^1*(6*n^0-1/24*n^2) = 0
n^1
(-1/24)*n^2+6 = 0
(-1/24)*n^2+6 = 0
DELTA = 0^2-(4*6*(-1/24))
DELTA = 1
DELTA > 0
n = (1^(1/2)+0)/(2*(-1/24)) or n = (0-1^(1/2))/(2*(-1/24))
n = -12 or n = 12
n in { -12, 12}
n in { -12, 12 }
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