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D( n )
n-1 = 0
n+3 = 0
n-1 = 0
n-1 = 0
n-1 = 0 // + 1
n = 1
n+3 = 0
n+3 = 0
n+3 = 0 // - 3
n = -3
n in (-oo:-3) U (-3:1) U (1:+oo)
(n+3)/(n-1) = 5/3-(2/(n+3)) // - 5/3-(2/(n+3))
(n+3)/(n-1)+2/(n+3)-(5/3) = 0
(n+3)/(n-1)+2/(n+3)-5/3 = 0
(3*(n+3)^2)/(3*(n-1)*(n+3))+(2*3*(n-1))/(3*(n-1)*(n+3))+(-5*(n-1)*(n+3))/(3*(n-1)*(n+3)) = 0
3*(n+3)^2+2*3*(n-1)-5*(n-1)*(n+3) = 0
3*n^2-5*n^2+24*n-10*n+15+21 = 0
14*n-2*n^2+36 = 0
14*n-2*n^2+36 = 0
2*(7*n-n^2+18) = 0
7*n-n^2+18 = 0
DELTA = 7^2-(-1*4*18)
DELTA = 121
DELTA > 0
n = (121^(1/2)-7)/(-1*2) or n = (-121^(1/2)-7)/(-1*2)
n = -2 or n = 9
2*(n+2)*(n-9) = 0
(2*(n+2)*(n-9))/(3*(n-1)*(n+3)) = 0
(2*(n+2)*(n-9))/(3*(n-1)*(n+3)) = 0 // * 3*(n-1)*(n+3)
2*(n+2)*(n-9) = 0
( n+2 )
n+2 = 0 // - 2
n = -2
( n-9 )
n-9 = 0 // + 9
n = 9
n in { -2, 9 }
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