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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)
(2*x-8)/(x-1) = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x = 4
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