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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = -12 // + 12
2/n+12 = 0
2*n^-1 = -12 // : 2
n^-1 = -6
-1 < 0
1/(n^1) = -6 // * n^1
1 = -6*n^1 // : -6
-1/6 = n^1
n = -1/6
n = -1/6
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