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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
39/19 = 12/n // - 12/n
39/19-(12/n) = 0
39/19-12*n^-1 = 0
-12*n^-1 = -39/19 // : -12
n^-1 = 13/76
-1 < 0
1/(n^1) = 13/76 // * n^1
1 = 13/76*n^1 // : 13/76
76/13 = n^1
n = 76/13
n = 76/13
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