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