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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
(6*x^2-x-13)/(3*x-5) = 0
6*x^2-x-13 = 0
6*x^2-x-13 = 0
DELTA = (-1)^2-(-13*4*6)
DELTA = 313
DELTA > 0
x = (313^(1/2)+1)/(2*6) or x = (1-313^(1/2))/(2*6)
x = (313^(1/2)+1)/12 or x = (1-313^(1/2))/12
(x-((1-313^(1/2))/12))*(x-((313^(1/2)+1)/12)) = 0
((x-((1-313^(1/2))/12))*(x-((313^(1/2)+1)/12)))/(3*x-5) = 0
( x-((1-313^(1/2))/12) )
x-((1-313^(1/2))/12) = 0 // + (1-313^(1/2))/12
x = (1-313^(1/2))/12
( x-((313^(1/2)+1)/12) )
x-((313^(1/2)+1)/12) = 0 // + (313^(1/2)+1)/12
x = (313^(1/2)+1)/12
x in { (1-313^(1/2))/12, (313^(1/2)+1)/12 }
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