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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)
(6*x-3)/(1-x) = 0
6*x-3 = 0 // + 3
6*x = 3 // : 6
x = 3/6
x = 1/2
x = 1/2
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