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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
225/n+39.99 = 118.74 // - 118.74
225/n-118.74+39.99 = 0
225*n^-1 = 78.75 // : 225
n^-1 = 0.35
-1 < 0
1/(n^1) = 0.35 // * n^1
1 = 0.35*n^1 // : 0.35
2.85714286 = n^1
n = 2.85714286
n = 2.85714286
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