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D( k )
k-8 = 0
k-8 = 0
k-8 = 0
k-8 = 0 // + 8
k = 8
k in (-oo:8) U (8:+oo)
k/11 = 3/(k-8) // - 3/(k-8)
k/11-(3/(k-8)) = 0
k/11-3*(k-8)^-1 = 0
k/11-3/(k-8) = 0
(-3*11)/(11*(k-8))+(k*(k-8))/(11*(k-8)) = 0
k*(k-8)-3*11 = 0
k^2-8*k-33 = 0
k^2-8*k-33 = 0
k^2-8*k-33 = 0
DELTA = (-8)^2-(-33*1*4)
DELTA = 196
DELTA > 0
k = (196^(1/2)+8)/(1*2) or k = (8-196^(1/2))/(1*2)
k = 11 or k = -3
(k+3)*(k-11) = 0
((k+3)*(k-11))/(11*(k-8)) = 0
((k+3)*(k-11))/(11*(k-8)) = 0 // * 11*(k-8)
(k+3)*(k-11) = 0
( k+3 )
k+3 = 0 // - 3
k = -3
( k-11 )
k-11 = 0 // + 11
k = 11
k in { -3, 11 }
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