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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(1/4)/n = 12 // - 12
(1/4)/n-12 = 0
1/4*n^-1 = 12 // : 1/4
n^-1 = 48
-1 < 0
1/(n^1) = 48 // * n^1
1 = 48*n^1 // : 48
1/48 = n^1
n = 1/48
n = 1/48
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