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D( x )
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:+oo)
(2*x-4)/39 = 24/(2*x-4) // - 24/(2*x-4)
(2*x-4)/39-(24/(2*x-4)) = 0
(2*x-4)/39-24*(2*x-4)^-1 = 0
(2*x-4)/39-24/(2*x-4) = 0
((2*x-4)^2)/(39*(2*x-4))+(-24*39)/(39*(2*x-4)) = 0
(2*x-4)^2-24*39 = 0
4*x^2-16*x-920 = 0
4*x^2-16*x-920 = 0
4*(x^2-4*x-230) = 0
x^2-4*x-230 = 0
DELTA = (-4)^2-(-230*1*4)
DELTA = 936
DELTA > 0
x = (936^(1/2)+4)/(1*2) or x = (4-936^(1/2))/(1*2)
x = (6*26^(1/2)+4)/2 or x = (4-6*26^(1/2))/2
4*(x-((4-6*26^(1/2))/2))*(x-((6*26^(1/2)+4)/2)) = 0
(4*(x-((4-6*26^(1/2))/2))*(x-((6*26^(1/2)+4)/2)))/(39*(2*x-4)) = 0
(4*(x-((4-6*26^(1/2))/2))*(x-((6*26^(1/2)+4)/2)))/(39*(2*x-4)) = 0 // * 39*(2*x-4)
4*(x-((4-6*26^(1/2))/2))*(x-((6*26^(1/2)+4)/2)) = 0
( x-((4-6*26^(1/2))/2) )
x-((4-6*26^(1/2))/2) = 0 // + (4-6*26^(1/2))/2
x = (4-6*26^(1/2))/2
( x-((6*26^(1/2)+4)/2) )
x-((6*26^(1/2)+4)/2) = 0 // + (6*26^(1/2)+4)/2
x = (6*26^(1/2)+4)/2
x in { (4-6*26^(1/2))/2, (6*26^(1/2)+4)/2 }
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