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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
26/n = 52/13 // - 52/13
26/n-(52/13) = 0
26/n-4 = 0
26*n^-1 = 4 // : 26
n^-1 = 2/13
-1 < 0
1/(n^1) = 2/13 // * n^1
1 = 2/13*n^1 // : 2/13
13/2 = n^1
n = 13/2
n = 13/2
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