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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 6/n+4 // - 6/n+4
2/n-(6/n)-4 = 0
2/n-6*n^-1-4 = 0
-4*n^-1 = 4 // : -4
n^-1 = -1
-1 < 0
1/(n^1) = -1 // * n^1
1 = -1*n^1 // : -1
-1 = n^1
n = -1
n = -1
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