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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.5/2.5 = 0.3/n // - 0.3/n
1.5/2.5-(0.3/n) = 0
1.5/2.5-0.3*n^-1 = 0
-0.3*n^-1 = -0.6 // : -0.3
n^-1 = 2
-1 < 0
1/(n^1) = 2 // * n^1
1 = 2*n^1 // : 2
1/2 = n^1
n = 1/2
n = 1/2
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