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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)
5 = 1/(1-x) // - 1/(1-x)
5-(1/(1-x)) = 0
5-(1-x)^-1 = 0
5-1/(1-x) = 0
(5*(1-x))/(1-x)-1/(1-x) = 0
5*(1-x)-1 = 0
4-5*x = 0
(4-5*x)/(1-x) = 0
(4-5*x)/(1-x) = 0 // * 1-x
4-5*x = 0
4-5*x = 0 // - 4
-5*x = -4 // : -5
x = -4/(-5)
x = 4/5
x = 4/5
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