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D( n )
6*n*n = 0
6*n = 0
3*n*n = 0
6*n*n = 0
6*n*n = 0
6*n^2 = 0 // : 6
n^2 = 0
n = 0
6*n = 0
6*n = 0
6*n = 0 // : 6
n = 0
3*n*n = 0
3*n*n = 0
3*n^2 = 0 // : 3
n^2 = 0
n = 0
n in (-oo:0) U (0:+oo)
1/(6*n) = (n-3)/(3*n*n)-(1/(6*n*n)) // - (n-3)/(3*n*n)-(1/(6*n*n))
1/(6*n)-((n-3)/(3*n*n))+1/(6*n*n) = 0
(-1/3)*n^-2*(n-3)+1/(6*n)+1/(6*n*n) = 0
1/(6*n)-1/3*n^-2*(n-3)+1/(6*n^2) = 0
(-1/3*6*6*n^-2*n*n^2*(n-3))/(6*6*n*n^2)+(1*6*n^2)/(6*6*n*n^2)+(1*6*n)/(6*6*n*n^2) = 0
1*6*n^2-1/3*6*6*n^-2*n*n^2*(n-3)+1*6*n = 0
36*n-6*n^2+6*n = 0
42*n-6*n^2 = 0
42*n-6*n^2 = 0
6*n*(7-n) = 0
7-n = 0 // - 7
-n = -7 // * -1
n = 7
6*n*(n-7) = 0
(6*n*(n-7))/(6*6*n*n^2) = 0
(6*n*(n-7))/(6*6*n*n^2) = 0 // * 6*6*n*n^2
6*n*(n-7) = 0
( 6*n )
6*n = 0 // : 6
n = 0
( n-7 )
n-7 = 0 // + 7
n = 7
n in { 0}
n = 7
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