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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(12/4)/3 = 36/n // - 36/n
(12/4)/3-(36/n) = 0
(12/4)/3-36*n^-1 = 0
-36*n^-1 = -1 // : -36
n^-1 = 1/36
-1 < 0
1/(n^1) = 1/36 // * n^1
1 = 1/36*n^1 // : 1/36
36 = n^1
n = 36
n = 36
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