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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-9/n = 4/12 // - 4/12
-9/n-(4/12) = 0
-9/n-1/3 = 0
-9*n^-1 = 1/3 // : -9
n^-1 = -1/27
-1 < 0
1/(n^1) = -1/27 // * n^1
1 = -1/27*n^1 // : -1/27
-27 = n^1
n = -27
n = -27
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