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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(30/6)/5 = 150/n // - 150/n
(30/6)/5-(150/n) = 0
(30/6)/5-150*n^-1 = 0
-150*n^-1 = -1 // : -150
n^-1 = 1/150
-1 < 0
1/(n^1) = 1/150 // * n^1
1 = 1/150*n^1 // : 1/150
150 = n^1
n = 150
n = 150
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