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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/(x-1) = 2/3 // - 2/3
1/(x-1)-(2/3) = 0
1/(x-1)-2/3 = 0
(1*3)/(3*(x-1))+(-2*(x-1))/(3*(x-1)) = 0
1*3-2*(x-1) = 0
5-2*x = 0
(5-2*x)/(3*(x-1)) = 0
(5-2*x)/(3*(x-1)) = 0 // * 3*(x-1)
5-2*x = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x = 5/2
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