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D( n )
3*n = 0
n^3-(3*n^2) = 0
3*n = 0
3*n = 0
3*n = 0 // : 3
n = 0
n^3-(3*n^2) = 0
n^3-(3*n^2) = 0
n^3-3*n^2 = 0
n^3-3*n^2 = 0
n^2*(n-3) = 0
n-3 = 0 // + 3
n = 3
n^2 = 0
1*n^2 = 0 // : 1
n^2 = 0
n = 0
n in (-oo:0) U (0:3) U (3:+oo)
6/(n^3-(3*n^2)) = 5/(3*n)-((n-6)/(n^3-(3*n^2))) // - 5/(3*n)-((n-6)/(n^3-(3*n^2)))
6/(n^3-(3*n^2))+(n-6)/(n^3-(3*n^2))-(5/(3*n)) = 0
6/(n^3-3*n^2)+(n-6)/(n^3-3*n^2)+(-5/3)*n^-1 = 0
6/(n^3-3*n^2)+(n-6)/(n^3-3*n^2)-5/(3*n) = 0
n^3-3*n^2 = 0
n^3-3*n^2 = 0
n^2*(n-3) = 0
n-3 = 0 // + 3
n = 3
n^2*(n-3) = 0
6/(n^2*(n-3))+(n-6)/(n^2*(n-3))-5/(3*n) = 0
(3*6*n)/(3*n*n^2*(n-3))+(3*n*(n-6))/(3*n*n^2*(n-3))+(-5*n^2*(n-3))/(3*n*n^2*(n-3)) = 0
3*n*(n-6)-5*n^2*(n-3)+3*6*n = 0
3*n^2-5*n^3+15*n^2 = 0
18*n^2-5*n^3 = 0
18*n^2-5*n^3 = 0
n^2*(18-5*n) = 0
18-5*n = 0 // - 18
-5*n = -18 // : -5
n = -18/(-5)
n = 18/5
n^2*(n-18/5) = 0
(n^2*(n-18/5))/(3*n*n^2*(n-3)) = 0
(n^2*(n-18/5))/(3*n*n^2*(n-3)) = 0 // * 3*n*n^2*(n-3)
n^2*(n-18/5) = 0
( n-18/5 )
n-18/5 = 0 // + 18/5
n = 18/5
( n^2 )
1*n^2 = 0 // : 1
n^2 = 0
n = 0
n in { 0}
n = 18/5
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