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D( k )
3*k-2 = 0
4*k = 0
3*k-2 = 0
3*k-2 = 0
3*k-2 = 0 // + 2
3*k = 2 // : 3
k = 2/3
4*k = 0
4*k = 0
4*k = 0 // : 4
k = 0
k in (-oo:0) U (0:2/3) U (2/3:+oo)
(((k+4)/8)/(3*k-2))/(4*k) = 0
(k+4)/(4*8*k*(3*k-2)) = 0
k+4 = 0 // - 4
k = -4
k = -4
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