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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
0.75 = 3/n // - 3/n
0.75-(3/n) = 0
0.75-3*n^-1 = 0
-3*n^-1 = -0.75 // : -3
n^-1 = 0.25
-1 < 0
1/(n^1) = 0.25 // * n^1
1 = 0.25*n^1 // : 0.25
4 = n^1
n = 4
n = 4
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