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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
36/n = 72/1 // - 72/1
36/n-(72/1) = 0
36/n-72 = 0
36*n^-1 = 72 // : 36
n^-1 = 2
-1 < 0
1/(n^1) = 2 // * n^1
1 = 2*n^1 // : 2
1/2 = n^1
n = 1/2
n = 1/2
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