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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/n = 30/125 // - 30/125
12/n-(30/125) = 0
12/n-6/25 = 0
12*n^-1 = 6/25 // : 12
n^-1 = 1/50
-1 < 0
1/(n^1) = 1/50 // * n^1
1 = 1/50*n^1 // : 1/50
50 = n^1
n = 50
n = 50
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