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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 1.5*60 // - 1.5*60
8/n-(1.5*60) = 0
8/n-90 = 0
8*n^-1 = 90 // : 8
n^-1 = 45/4
-1 < 0
1/(n^1) = 45/4 // * n^1
1 = 45/4*n^1 // : 45/4
4/45 = n^1
n = 4/45
n = 4/45
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