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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n = 16/n-6 // - 16/n-6
n-(16/n)+6 = 0
n-16*n^-1+6 = 0
1*n^1-16*n^-1+6*n^0 = 0
(1*n^2+6*n^1-16*n^0)/(n^1) = 0 // * n^2
n^1*(1*n^2+6*n^1-16*n^0) = 0
n^1
n^2+6*n-16 = 0
n^2+6*n-16 = 0
DELTA = 6^2-(-16*1*4)
DELTA = 100
DELTA > 0
n = (100^(1/2)-6)/(1*2) or n = (-100^(1/2)-6)/(1*2)
n = 2 or n = -8
n in { -8, 2}
n in { -8, 2 }
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