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D( k )
k-2 = 0
k-2 = 0
k-2 = 0
k-2 = 0 // + 2
k = 2
k in (-oo:2) U (2:+oo)
6/(k-2) = 10 // - 10
6/(k-2)-10 = 0
6/(k-2)+(-10*(k-2))/(k-2) = 0
6-10*(k-2) = 0
26-10*k = 0
(26-10*k)/(k-2) = 0
(26-10*k)/(k-2) = 0 // * k-2
26-10*k = 0
26-10*k = 0 // - 26
-10*k = -26 // : -10
k = -26/(-10)
k = 13/5
k = 13/5
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