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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
19/2 = 57/n // - 57/n
19/2-(57/n) = 0
19/2-57*n^-1 = 0
-57*n^-1 = -19/2 // : -57
n^-1 = 1/6
-1 < 0
1/(n^1) = 1/6 // * n^1
1 = 1/6*n^1 // : 1/6
6 = n^1
n = 6
n = 6
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