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D( n )
6*n = 0
3*n = 0
6*n = 0
6*n = 0
6*n = 0 // : 6
n = 0
3*n = 0
3*n = 0
3*n = 0 // : 3
n = 0
n in (-oo:0) U (0:+oo)
1/(6*n)+4/(3*n) = 3 // - 3
1/(6*n)+4/(3*n)-3 = 0
3/2*n^-1 = 3 // : 3/2
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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