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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
26/8 = 104/n // - 104/n
26/8-(104/n) = 0
26/8-104*n^-1 = 0
-104*n^-1 = -13/4 // : -104
n^-1 = 1/32
-1 < 0
1/(n^1) = 1/32 // * n^1
1 = 1/32*n^1 // : 1/32
32 = n^1
n = 32
n = 32
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