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D( x )
1-x = 0
x-3 = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:1) U (1:3) U (3:+oo)
3/(x-3)-(2/(1-x)) = 0
3/(x-3)-2*(1-x)^-1 = 0
3/(x-3)-2/(1-x) = 0
(3*(1-x))/((x-3)*(1-x))+(-2*(x-3))/((x-3)*(1-x)) = 0
3*(1-x)-2*(x-3) = 0
9-5*x = 0
(9-5*x)/((x-3)*(1-x)) = 0
(9-5*x)/((x-3)*(1-x)) = 0 // * (x-3)*(1-x)
9-5*x = 0
9-5*x = 0 // - 9
-5*x = -9 // : -5
x = -9/(-5)
x = 9/5
x = 9/5
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