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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
48/12 = 9/n // - 9/n
48/12-(9/n) = 0
48/12-9*n^-1 = 0
-9*n^-1 = -4 // : -9
n^-1 = 4/9
-1 < 0
1/(n^1) = 4/9 // * n^1
1 = 4/9*n^1 // : 4/9
9/4 = n^1
n = 9/4
n = 9/4
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