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D( k )
k-6 = 0
k-6 = 0
k-6 = 0
k-6 = 0 // + 6
k = 6
k in (-oo:6) U (6:+oo)
12/(k-6) = 3/11 // - 3/11
12/(k-6)-(3/11) = 0
12/(k-6)-3/11 = 0
(11*12)/(11*(k-6))+(-3*(k-6))/(11*(k-6)) = 0
11*12-3*(k-6) = 0
150-3*k = 0
(150-3*k)/(11*(k-6)) = 0
(150-3*k)/(11*(k-6)) = 0 // * 11*(k-6)
150-3*k = 0
150-3*k = 0 // - 150
-3*k = -150 // : -3
k = -150/(-3)
k = 50
k = 50
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