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D( x )
x-6 = 0
x-4 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:6) U (6:+oo)
x/(x-6) = 1/(x-4) // - 1/(x-4)
x/(x-6)-(1/(x-4)) = 0
x/(x-6)-(x-4)^-1 = 0
x/(x-6)-1/(x-4) = 0
(x*(x-4))/((x-6)*(x-4))+(-1*(x-6))/((x-6)*(x-4)) = 0
x*(x-4)-1*(x-6) = 0
x^2-5*x+6 = 0
x^2-5*x+6 = 0
x^2-5*x+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)+5)/(1*2) or x = (5-1^(1/2))/(1*2)
x = 3 or x = 2
(x-2)*(x-3) = 0
((x-2)*(x-3))/((x-6)*(x-4)) = 0
((x-2)*(x-3))/((x-6)*(x-4)) = 0 // * (x-6)*(x-4)
(x-2)*(x-3) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 2, 3 }
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