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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/7 = 1/n // - 1/n
12/7-(1/n) = 0
12/7-n^-1 = 0
-1*n^-1 = -12/7 // : -1
n^-1 = 12/7
-1 < 0
1/(n^1) = 12/7 // * n^1
1 = 12/7*n^1 // : 12/7
7/12 = n^1
n = 7/12
n = 7/12
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