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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 36/4 // - 36/4
3/n-(36/4) = 0
3/n-9 = 0
3*n^-1 = 9 // : 3
n^-1 = 3
-1 < 0
1/(n^1) = 3 // * n^1
1 = 3*n^1 // : 3
1/3 = n^1
n = 1/3
n = 1/3
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