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