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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/4 = 19/n // - 19/n
2/4-(19/n) = 0
2/4-19*n^-1 = 0
-19*n^-1 = -1/2 // : -19
n^-1 = 1/38
-1 < 0
1/(n^1) = 1/38 // * n^1
1 = 1/38*n^1 // : 1/38
38 = n^1
n = 38
n = 38
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