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D( x )
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
(2*x^2-(11*x)+2)/(2*x+1) = 0
(2*x^2-11*x+2)/(2*x+1) = 0
2*x^2-11*x+2 = 0
2*x^2-11*x+2 = 0
DELTA = (-11)^2-(2*2*4)
DELTA = 105
DELTA > 0
x = (105^(1/2)+11)/(2*2) or x = (11-105^(1/2))/(2*2)
x = (105^(1/2)+11)/4 or x = (11-105^(1/2))/4
(x-((11-105^(1/2))/4))*(x-((105^(1/2)+11)/4)) = 0
((x-((11-105^(1/2))/4))*(x-((105^(1/2)+11)/4)))/(2*x+1) = 0
( x-((105^(1/2)+11)/4) )
x-((105^(1/2)+11)/4) = 0 // + (105^(1/2)+11)/4
x = (105^(1/2)+11)/4
( x-((11-105^(1/2))/4) )
x-((11-105^(1/2))/4) = 0 // + (11-105^(1/2))/4
x = (11-105^(1/2))/4
x in { (105^(1/2)+11)/4, (11-105^(1/2))/4 }
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