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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)
(x/(1-x))*(3-(5*x)) = 0
(x/(1-x))*(3-5*x) = 0
(x*(3-5*x))/(1-x) = 0
( 3-5*x )
3-5*x = 0 // - 3
-5*x = -3 // : -5
x = -3/(-5)
x = 3/5
( x )
x = 0
x in { 3/5, 0 }
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