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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)
(x-2)/4 = 8/(x-6) // - 8/(x-6)
(x-2)/4-(8/(x-6)) = 0
(x-2)/4-8*(x-6)^-1 = 0
(x-2)/4-8/(x-6) = 0
((x-2)*(x-6))/(4*(x-6))+(-8*4)/(4*(x-6)) = 0
(x-2)*(x-6)-8*4 = 0
x^2-8*x-20 = 0
x^2-8*x-20 = 0
x^2-8*x-20 = 0
DELTA = (-8)^2-(-20*1*4)
DELTA = 144
DELTA > 0
x = (144^(1/2)+8)/(1*2) or x = (8-144^(1/2))/(1*2)
x = 10 or x = -2
(x+2)*(x-10) = 0
((x+2)*(x-10))/(4*(x-6)) = 0
((x+2)*(x-10))/(4*(x-6)) = 0 // * 4*(x-6)
(x+2)*(x-10) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-10 )
x-10 = 0 // + 10
x = 10
x in { -2, 10 }
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