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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)
0.33/(x-1) = 1 // - 1
0.33/(x-1)-1 = 0
0.33/(x-1)+(-1*(x-1))/(x-1) = 0
0.33-1*(x-1) = 0
1.33-x = 0
(1.33-x)/(x-1) = 0
(1.33-x)/(x-1) = 0 // * x-1
1.33-x = 0
1.33-x = 0 // - 1.33
-x = -1.33 // * -1
x = 1.33
x = 1.33
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