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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
48/9 = 72/n // - 72/n
48/9-(72/n) = 0
48/9-72*n^-1 = 0
-72*n^-1 = -16/3 // : -72
n^-1 = 2/27
-1 < 0
1/(n^1) = 2/27 // * n^1
1 = 2/27*n^1 // : 2/27
27/2 = n^1
n = 27/2
n = 27/2
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