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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
19/n = 8/5 // - 8/5
19/n-(8/5) = 0
19/n-8/5 = 0
19*n^-1 = 8/5 // : 19
n^-1 = 8/95
-1 < 0
1/(n^1) = 8/95 // * n^1
1 = 8/95*n^1 // : 8/95
95/8 = n^1
n = 95/8
n = 95/8
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