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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
35/n = 5/28 // - 5/28
35/n-(5/28) = 0
35/n-5/28 = 0
35*n^-1 = 5/28 // : 35
n^-1 = 1/196
-1 < 0
1/(n^1) = 1/196 // * n^1
1 = 1/196*n^1 // : 1/196
196 = n^1
n = 196
n = 196
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