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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
53/n = 30/98 // - 30/98
53/n-(30/98) = 0
53/n-15/49 = 0
53*n^-1 = 15/49 // : 53
n^-1 = 15/2597
-1 < 0
1/(n^1) = 15/2597 // * n^1
1 = 15/2597*n^1 // : 15/2597
2597/15 = n^1
n = 2597/15
n = 2597/15
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