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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(1-(2*x))/(x-1) = 10 // - 10
(1-(2*x))/(x-1)-10 = 0
(1-2*x)/(x-1)-10 = 0
(1-2*x)/(x-1)+(-10*(x-1))/(x-1) = 0
1-10*(x-1)-2*x = 0
11-12*x = 0
(11-12*x)/(x-1) = 0
(11-12*x)/(x-1) = 0 // * x-1
11-12*x = 0
11-12*x = 0 // - 11
-12*x = -11 // : -12
x = -11/(-12)
x = 11/12
x = 11/12
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