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D( k )
k-4 = 0
k-4 = 0
k-4 = 0
k-4 = 0 // + 4
k = 4
k in (-oo:4) U (4:+oo)
3/(k-4) = 3/4 // - 3/4
3/(k-4)-(3/4) = 0
3/(k-4)-3/4 = 0
(3*4)/(4*(k-4))+(-3*(k-4))/(4*(k-4)) = 0
3*4-3*(k-4) = 0
24-3*k = 0
(24-3*k)/(4*(k-4)) = 0
(24-3*k)/(4*(k-4)) = 0 // * 4*(k-4)
24-3*k = 0
24-3*k = 0 // - 24
-3*k = -24 // : -3
k = -24/(-3)
k = 8
k = 8
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