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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
25/n = (3/7)/30 // - (3/7)/30
25/n-((3/7)/30) = 0
25/n-1/70 = 0
25*n^-1 = 1/70 // : 25
n^-1 = 1/1750
-1 < 0
1/(n^1) = 1/1750 // * n^1
1 = 1/1750*n^1 // : 1/1750
1750 = n^1
n = 1750
n = 1750
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