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D( x )
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in (-oo:1/5) U (1/5:+oo)
7/(5*x-1) = (1/4)*x // - (1/4)*x
7/(5*x-1)-((1/4)*x) = 0
7/(5*x-1)+(-1/4)*x = 0
7/(5*x-1)-x/4 = 0
(4*7)/(4*(5*x-1))+(-x*(5*x-1))/(4*(5*x-1)) = 0
4*7-x*(5*x-1) = 0
x-5*x^2+28 = 0
x-5*x^2+28 = 0
x-5*x^2+28 = 0
DELTA = 1^2-(-5*4*28)
DELTA = 561
DELTA > 0
x = (561^(1/2)-1)/(-5*2) or x = (-561^(1/2)-1)/(-5*2)
x = (561^(1/2)-1)/(-10) or x = (561^(1/2)+1)/10
(x-((561^(1/2)-1)/(-10)))*(x-((561^(1/2)+1)/10)) = 0
((x-((561^(1/2)-1)/(-10)))*(x-((561^(1/2)+1)/10)))/(4*(5*x-1)) = 0
((x-((561^(1/2)-1)/(-10)))*(x-((561^(1/2)+1)/10)))/(4*(5*x-1)) = 0 // * 4*(5*x-1)
(x-((561^(1/2)-1)/(-10)))*(x-((561^(1/2)+1)/10)) = 0
( x-((561^(1/2)+1)/10) )
x-((561^(1/2)+1)/10) = 0 // + (561^(1/2)+1)/10
x = (561^(1/2)+1)/10
( x-((561^(1/2)-1)/(-10)) )
x-((561^(1/2)-1)/(-10)) = 0 // + (561^(1/2)-1)/(-10)
x = (561^(1/2)-1)/(-10)
x in { (561^(1/2)+1)/10, (561^(1/2)-1)/(-10) }
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