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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/n = 3/10 // - 3/10
12/n-(3/10) = 0
12/n-3/10 = 0
12*n^-1 = 3/10 // : 12
n^-1 = 1/40
-1 < 0
1/(n^1) = 1/40 // * n^1
1 = 1/40*n^1 // : 1/40
40 = n^1
n = 40
n = 40
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