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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/3 = 51/n // - 51/n
4/3-(51/n) = 0
4/3-51*n^-1 = 0
-51*n^-1 = -4/3 // : -51
n^-1 = 4/153
-1 < 0
1/(n^1) = 4/153 // * n^1
1 = 4/153*n^1 // : 4/153
153/4 = n^1
n = 153/4
n = 153/4
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