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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
1/(x-2)+1*(x-4) = 0
1/(x-2)+x-4 = 0
1/(x-2)+(x*(x-2))/(x-2)+(-4*(x-2))/(x-2) = 0
x*(x-2)-4*(x-2)+1 = 0
x^2-2*x-4*x+1+8 = 0
x^2-6*x+9 = 0
x^2-6*x+9 = 0
x^2-6*x+9 = 0
DELTA = (-6)^2-(1*4*9)
DELTA = 0
x = 6/(1*2)
x = 3 or x = 3
(x-3)^2 = 0
((x-3)^2)/(x-2) = 0
((x-3)^2)/(x-2) = 0 // * x-2
(x-3)^2 = 0
x-3 = 0 // + 3
x = 3
x in { 3, 3 }
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