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