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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) = 2.25 // - 2.25
x/(1-x)-2.25 = 0
x/(1-x)+(-2.25*(1-x))/(1-x) = 0
x-2.25*(1-x) = 0
3.25*x-2.25 = 0
(3.25*x-2.25)/(1-x) = 0
(3.25*x-2.25)/(1-x) = 0 // * 1-x
3.25*x-2.25 = 0
3.25*x-2.25 = 0 // + 2.25
3.25*x = 2.25 // : 3.25
x = 2.25/3.25
x = 0.69230769
x = 0.69230769
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