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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/35 = 120/n // - 120/n
24/35-(120/n) = 0
24/35-120*n^-1 = 0
-120*n^-1 = -24/35 // : -120
n^-1 = 1/175
-1 < 0
1/(n^1) = 1/175 // * n^1
1 = 1/175*n^1 // : 1/175
175 = n^1
n = 175
n = 175
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