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