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