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D( n )
2*n-1 = 0
2*n-1 = 0
2*n-1 = 0
2*n-1 = 0 // + 1
2*n = 1 // : 2
n = 1/2
n in (-oo:1/2) U (1/2:+oo)
3*(2*n-1)-((4*(2*n-1))/(2*n-1))-(2*n) = 0
3*(2*n-1)-2*n-4 = 0
3*(2*n-1)-2*n-4 = 0
4*n-4-3 = 0
4*n-7 = 0
4*n-7 = 0
4*n-7 = 0 // + 7
4*n = 7 // : 4
n = 7/4
n = 7/4
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