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D( k )
-k-4 = 0
-k-4 = 0
-k-4 = 0
-k-4 = 0 // + 4
-k = 4 // * -1
k = -4
k in (-oo:-4) U (-4:+oo)
(2*k-5)/(-k-4) = -1 // + 1
(2*k-5)/(-k-4)+1 = 0
(2*k-5)/(-k-4)+(1*(-k-4))/(-k-4) = 0
1*(-k-4)+2*k-5 = 0
k-9 = 0
(k-9)/(-k-4) = 0
(k-9)/(-k-4) = 0 // * -k-4
k-9 = 0
k-9 = 0 // + 9
k = 9
k = 9
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