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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) = 28/38 // - 28/38
x/(1-x)-(28/38) = 0
x/(1-x)-14/19 = 0
(19*x)/(19*(1-x))+(-14*(1-x))/(19*(1-x)) = 0
19*x-14*(1-x) = 0
33*x-14 = 0
(33*x-14)/(19*(1-x)) = 0
(33*x-14)/(19*(1-x)) = 0 // * 19*(1-x)
33*x-14 = 0
33*x-14 = 0 // + 14
33*x = 14 // : 33
x = 14/33
x = 14/33
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