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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 13/7 // - 13/7
4/n-(13/7) = 0
4/n-13/7 = 0
4*n^-1 = 13/7 // : 4
n^-1 = 13/28
-1 < 0
1/(n^1) = 13/28 // * n^1
1 = 13/28*n^1 // : 13/28
28/13 = n^1
n = 28/13
n = 28/13
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