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