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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)
x-(10/(x-1)) = 0
x-10*(x-1)^-1 = 0
x-10/(x-1) = 0
(x*(x-1))/(x-1)-10/(x-1) = 0
x*(x-1)-10 = 0
x^2-x-10 = 0
x^2-x-10 = 0
x^2-x-10 = 0
DELTA = (-1)^2-(-10*1*4)
DELTA = 41
DELTA > 0
x = (41^(1/2)+1)/(1*2) or x = (1-41^(1/2))/(1*2)
x = (41^(1/2)+1)/2 or x = (1-41^(1/2))/2
(x-((1-41^(1/2))/2))*(x-((41^(1/2)+1)/2)) = 0
((x-((1-41^(1/2))/2))*(x-((41^(1/2)+1)/2)))/(x-1) = 0
((x-((1-41^(1/2))/2))*(x-((41^(1/2)+1)/2)))/(x-1) = 0 // * x-1
(x-((1-41^(1/2))/2))*(x-((41^(1/2)+1)/2)) = 0
( x-((1-41^(1/2))/2) )
x-((1-41^(1/2))/2) = 0 // + (1-41^(1/2))/2
x = (1-41^(1/2))/2
( x-((41^(1/2)+1)/2) )
x-((41^(1/2)+1)/2) = 0 // + (41^(1/2)+1)/2
x = (41^(1/2)+1)/2
x in { (1-41^(1/2))/2, (41^(1/2)+1)/2 }
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