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D( x )
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
(10*x^2-(17*x)-14)/(2*x-5) = 0
(10*x^2-17*x-14)/(2*x-5) = 0
10*x^2-17*x-14 = 0
10*x^2-17*x-14 = 0
DELTA = (-17)^2-(-14*4*10)
DELTA = 849
DELTA > 0
x = (849^(1/2)+17)/(2*10) or x = (17-849^(1/2))/(2*10)
x = (849^(1/2)+17)/20 or x = (17-849^(1/2))/20
(x-((17-849^(1/2))/20))*(x-((849^(1/2)+17)/20)) = 0
((x-((17-849^(1/2))/20))*(x-((849^(1/2)+17)/20)))/(2*x-5) = 0
( x-((17-849^(1/2))/20) )
x-((17-849^(1/2))/20) = 0 // + (17-849^(1/2))/20
x = (17-849^(1/2))/20
( x-((849^(1/2)+17)/20) )
x-((849^(1/2)+17)/20) = 0 // + (849^(1/2)+17)/20
x = (849^(1/2)+17)/20
x in { (17-849^(1/2))/20, (849^(1/2)+17)/20 }
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