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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)
((8*x)/(x-1))*(x-2) = 0
(8*x*(x-2))/(x-1) = 0
( 8*x )
8*x = 0 // : 8
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0, 2 }
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