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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(9*k-5)/6+(-3*k)/2 = (11*k+8)/k // - (11*k+8)/k
(9*k-5)/6-((11*k+8)/k)+(-3*k)/2 = 0
(9*k-5)/6+(-1*(11*k+8))/k+(-3*k)/2 = 0
(2*k*(9*k-5))/(2*6*k)+(-1*2*6*(11*k+8))/(2*6*k)+(-3*6*k*k)/(2*6*k) = 0
2*k*(9*k-5)-1*2*6*(11*k+8)-3*6*k*k = 0
18*k^2-18*k^2-142*k-96 = 0
-142*k-96 = 0
(-142*k-96)/(2*6*k) = 0
(-142*k-96)/(2*6*k) = 0 // * 2*6*k
-142*k-96 = 0
-142*k-96 = 0 // + 96
-142*k = 96 // : -142
k = 96/(-142)
k = -48/71
k = -48/71
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