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D( k )
2*k-3 = 0
2*k-3 = 0
2*k-3 = 0
2*k-3 = 0 // + 3
2*k = 3 // : 2
k = 3/2
k in (-oo:3/2) U (3/2:+oo)
(5*k+8)/(2*k-3) = 2*((4*k+1)/(2*k-3)) // - 2*((4*k+1)/(2*k-3))
(5*k+8)/(2*k-3)-(2*((4*k+1)/(2*k-3))) = 0
(5*k+8)/(2*k-3)-2*(2*k-3)^-1*(4*k+1) = 0
(5*k+8)/(2*k-3)+(-2*(4*k+1))/(2*k-3) = 0
5*k-2*(4*k+1)+8 = 0
6-3*k = 0
(6-3*k)/(2*k-3) = 0
(6-3*k)/(2*k-3) = 0 // * 2*k-3
6-3*k = 0
6-3*k = 0 // - 6
-3*k = -6 // : -3
k = -6/(-3)
k = 2
k = 2
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