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D( n )
3*n-3 = 0
3*n+3 = 0
9*n^2-9 = 0
3*n-3 = 0
3*n-3 = 0
3*n-3 = 0 // + 3
3*n = 3 // : 3
n = 3/3
n = 1
3*n+3 = 0
3*n+3 = 0
3*n+3 = 0 // - 3
3*n = -3 // : 3
n = -3/3
n = -1
9*n^2-9 = 0
9*n^2-9 = 0
9*n^2 = 9 // : 9
n^2 = 1
n^2 = 1 // ^ 1/2
abs(n) = 1
n = 1 or n = -1
n in (-oo:-1) U (-1:1) U (1:+oo)
3/(3*n+3)-2/(3*n-3) = -1/(9*n^2-9) // + -1/(9*n^2-9)
3/(3*n+3)-2/(3*n-3)-(-1/(9*n^2-9)) = 0
3/(3*n+3)-2/(3*n-3)+(9*n^2-9)^-1 = 0
3/(3*n+3)-2/(3*n-3)+1/(9*n^2-9) = 0
(-2*(3*n+3)*(9*n^2-9))/((3*n-3)*(3*n+3)*(9*n^2-9))+(3*(3*n-3)*(9*n^2-9))/((3*n-3)*(3*n+3)*(9*n^2-9))+((3*n-3)*(3*n+3))/((3*n-3)*(3*n+3)*(9*n^2-9)) = 0
3*(3*n-3)*(9*n^2-9)-2*(3*n+3)*(9*n^2-9)+(3*n-3)*(3*n+3) = 0
27*n^3-135*n^2+9*n^2-27*n-9+135 = 0
27*n^3-126*n^2-27*n+126 = 0
27*n^3-126*n^2-27*n+126 = 0
9*(3*n^3-14*n^2-3*n+14) = 0
3*n^3-14*n^2-3*n+14 = 0
{ 1, -1, 2, -2, 7, -7, 14, -14 }
1
n = 1
3*n^3-14*n^2-3*n+14 = 0
1
n-1
3*n^2-11*n-14
3*n^3-14*n^2-3*n+14
n-1
3*n^2-3*n^3
14-11*n^2-3*n
11*n^2-11*n
14-14*n
14*n-14
0
3*n^2-11*n-14 = 0
DELTA = (-11)^2-(-14*3*4)
DELTA = 289
DELTA > 0
n = (289^(1/2)+11)/(2*3) or n = (11-289^(1/2))/(2*3)
n = 14/3 or n = -1
n in { -1, 14/3, 1}
9*(n+1)*(n-14/3)*(n-1) = 0
(9*(n+1)*(n-14/3)*(n-1))/((3*n-3)*(3*n+3)*(9*n^2-9)) = 0
(9*(n+1)*(n-14/3)*(n-1))/((3*n-3)*(3*n+3)*(9*n^2-9)) = 0 // * (3*n-3)*(3*n+3)*(9*n^2-9)
9*(n+1)*(n-14/3)*(n-1) = 0
( n+1 )
n+1 = 0 // - 1
n = -1
( n-1 )
n-1 = 0 // + 1
n = 1
( n-14/3 )
n-14/3 = 0 // + 14/3
n = 14/3
n in { -1}
n in { 1}
n = 14/3
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