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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/5 = 175/n // - 175/n
7/5-(175/n) = 0
7/5-175*n^-1 = 0
-175*n^-1 = -7/5 // : -175
n^-1 = 1/125
-1 < 0
1/(n^1) = 1/125 // * n^1
1 = 1/125*n^1 // : 1/125
125 = n^1
n = 125
n = 125
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