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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-5.4/28.8 = -9/n // + -9/n
-(-9/n)-5.4/28.8 = 0
9*n^-1-5.4/28.8 = 0
9*n^-1 = 0.1875 // : 9
n^-1 = 0.02083333
-1 < 0
1/(n^1) = 0.02083333 // * n^1
1 = 0.02083333*n^1 // : 0.02083333
48.00000768 = n^1
n = 48.00000768
n = 48.00000768
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