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D( n )
3*n-1 = 0
2*n-3 = 0
3*n-1 = 0
3*n-1 = 0
3*n-1 = 0 // + 1
3*n = 1 // : 3
n = 1/3
2*n-3 = 0
2*n-3 = 0
2*n-3 = 0 // + 3
2*n = 3 // : 2
n = 3/2
n in (-oo:1/3) U (1/3:3/2) U (3/2:+oo)
1/(2*n-3)-(2/(3*n-1)) = 0
1/(2*n-3)-2*(3*n-1)^-1 = 0
1/(2*n-3)-2/(3*n-1) = 0
(1*(3*n-1))/((2*n-3)*(3*n-1))+(-2*(2*n-3))/((2*n-3)*(3*n-1)) = 0
1*(3*n-1)-2*(2*n-3) = 0
5-n = 0
(5-n)/((2*n-3)*(3*n-1)) = 0
(5-n)/((2*n-3)*(3*n-1)) = 0 // * (2*n-3)*(3*n-1)
5-n = 0
5-n = 0 // - 5
-n = -5 // * -1
n = 5
n = 5
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