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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)
(4*x^2-(2*x)+7)/(x-1) = 0
(4*x^2-2*x+7)/(x-1) = 0
4*x^2-2*x+7 = 0
4*x^2-2*x+7 = 0
DELTA = (-2)^2-(4*4*7)
DELTA = -108
DELTA < 0
1 = 0
1/(x-1) = 0
x belongs to the empty set
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