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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 5/4 // - 5/4
3/n-(5/4) = 0
3/n-5/4 = 0
3*n^-1 = 5/4 // : 3
n^-1 = 5/12
-1 < 0
1/(n^1) = 5/12 // * n^1
1 = 5/12*n^1 // : 5/12
12/5 = n^1
n = 12/5
n = 12/5
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