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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)
7/(k-2) = 5/8 // - 5/8
7/(k-2)-(5/8) = 0
7/(k-2)-5/8 = 0
(7*8)/(8*(k-2))+(-5*(k-2))/(8*(k-2)) = 0
7*8-5*(k-2) = 0
66-5*k = 0
(66-5*k)/(8*(k-2)) = 0
(66-5*k)/(8*(k-2)) = 0 // * 8*(k-2)
66-5*k = 0
66-5*k = 0 // - 66
-5*k = -66 // : -5
k = -66/(-5)
k = 66/5
k = 66/5
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