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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/8 = 15/n // - 15/n
4/8-(15/n) = 0
4/8-15*n^-1 = 0
-15*n^-1 = -1/2 // : -15
n^-1 = 1/30
-1 < 0
1/(n^1) = 1/30 // * n^1
1 = 1/30*n^1 // : 1/30
30 = n^1
n = 30
n = 30
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