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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-5/n = -30 // + 30
30-5/n = 0
-5*n^-1 = -30 // : -5
n^-1 = 6
-1 < 0
1/(n^1) = 6 // * n^1
1 = 6*n^1 // : 6
1/6 = n^1
n = 1/6
n = 1/6
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