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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)
(2/3)*x = (x+3)/(2*x-5) // - (x+3)/(2*x-5)
(2/3)*x-((x+3)/(2*x-5)) = 0
(-1*(x+3))/(2*x-5)+(2*x)/3 = 0
(-1*3*(x+3))/(3*(2*x-5))+(2*x*(2*x-5))/(3*(2*x-5)) = 0
2*x*(2*x-5)-1*3*(x+3) = 0
4*x^2-13*x-9 = 0
4*x^2-13*x-9 = 0
4*x^2-13*x-9 = 0
DELTA = (-13)^2-(-9*4*4)
DELTA = 313
DELTA > 0
x = (313^(1/2)+13)/(2*4) or x = (13-313^(1/2))/(2*4)
x = (313^(1/2)+13)/8 or x = (13-313^(1/2))/8
(x-((13-313^(1/2))/8))*(x-((313^(1/2)+13)/8)) = 0
((x-((13-313^(1/2))/8))*(x-((313^(1/2)+13)/8)))/(3*(2*x-5)) = 0
((x-((13-313^(1/2))/8))*(x-((313^(1/2)+13)/8)))/(3*(2*x-5)) = 0 // * 3*(2*x-5)
(x-((13-313^(1/2))/8))*(x-((313^(1/2)+13)/8)) = 0
( x-((13-313^(1/2))/8) )
x-((13-313^(1/2))/8) = 0 // + (13-313^(1/2))/8
x = (13-313^(1/2))/8
( x-((313^(1/2)+13)/8) )
x-((313^(1/2)+13)/8) = 0 // + (313^(1/2)+13)/8
x = (313^(1/2)+13)/8
x in { (13-313^(1/2))/8, (313^(1/2)+13)/8 }
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