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D( n )
2*n-5 = 0
4*n-1 = 0
2*n-5 = 0
2*n-5 = 0
2*n-5 = 0 // + 5
2*n = 5 // : 2
n = 5/2
4*n-1 = 0
4*n-1 = 0
4*n-1 = 0 // + 1
4*n = 1 // : 4
n = 1/4
n in (-oo:1/4) U (1/4:5/2) U (5/2:+oo)
3/(4*n-1) = 2/(2*n-5) // - 2/(2*n-5)
3/(4*n-1)-(2/(2*n-5)) = 0
3/(4*n-1)-2*(2*n-5)^-1 = 0
3/(4*n-1)-2/(2*n-5) = 0
(3*(2*n-5))/((4*n-1)*(2*n-5))+(-2*(4*n-1))/((4*n-1)*(2*n-5)) = 0
3*(2*n-5)-2*(4*n-1) = 0
-2*n-13 = 0
(-2*n-13)/((4*n-1)*(2*n-5)) = 0
(-2*n-13)/((4*n-1)*(2*n-5)) = 0 // * (4*n-1)*(2*n-5)
-2*n-13 = 0
-2*n-13 = 0 // + 13
-2*n = 13 // : -2
n = 13/(-2)
n = -13/2
n = -13/2
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