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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)
(2*x-3)/(x-3) = (x-2)/(x-1) // - (x-2)/(x-1)
(2*x-3)/(x-3)-((x-2)/(x-1)) = 0
(2*x-3)/(x-3)+(-1*(x-2))/(x-1) = 0
((2*x-3)*(x-1))/((x-3)*(x-1))+(-1*(x-2)*(x-3))/((x-3)*(x-1)) = 0
(2*x-3)*(x-1)-1*(x-2)*(x-3) = 0
x^2-3 = 0
(x^2-3)/((x-3)*(x-1)) = 0
(x^2-3)/((x-3)*(x-1)) = 0 // * (x-3)*(x-1)
x^2-3 = 0
1*x^2 = 3 // : 1
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in { 3^(1/2), -3^(1/2) }
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