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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(3*x+7)/(x-6) = 8 // - 8
(3*x+7)/(x-6)-8 = 0
(3*x+7)/(x-6)+(-8*(x-6))/(x-6) = 0
3*x-8*(x-6)+7 = 0
55-5*x = 0
(55-5*x)/(x-6) = 0
(55-5*x)/(x-6) = 0 // * x-6
55-5*x = 0
55-5*x = 0 // - 55
-5*x = -55 // : -5
x = -55/(-5)
x = 11
x = 11
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