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