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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/3 = 12/n // - 12/n
2/3-(12/n) = 0
2/3-12*n^-1 = 0
-12*n^-1 = -2/3 // : -12
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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