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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
9/(2*x-1) = (15/3)*x // - (15/3)*x
9/(2*x-1)-((15/3)*x) = 0
9/(2*x-1)-5*x = 0
9/(2*x-1)+(-5*x*(2*x-1))/(2*x-1) = 0
9-5*x*(2*x-1) = 0
5*x-10*x^2+9 = 0
5*x-10*x^2+9 = 0
5*x-10*x^2+9 = 0
DELTA = 5^2-(-10*4*9)
DELTA = 385
DELTA > 0
x = (385^(1/2)-5)/(-10*2) or x = (-385^(1/2)-5)/(-10*2)
x = (385^(1/2)-5)/(-20) or x = (385^(1/2)+5)/20
(x-((385^(1/2)-5)/(-20)))*(x-((385^(1/2)+5)/20)) = 0
((x-((385^(1/2)-5)/(-20)))*(x-((385^(1/2)+5)/20)))/(2*x-1) = 0
((x-((385^(1/2)-5)/(-20)))*(x-((385^(1/2)+5)/20)))/(2*x-1) = 0 // * 2*x-1
(x-((385^(1/2)-5)/(-20)))*(x-((385^(1/2)+5)/20)) = 0
( x-((385^(1/2)+5)/20) )
x-((385^(1/2)+5)/20) = 0 // + (385^(1/2)+5)/20
x = (385^(1/2)+5)/20
( x-((385^(1/2)-5)/(-20)) )
x-((385^(1/2)-5)/(-20)) = 0 // + (385^(1/2)-5)/(-20)
x = (385^(1/2)-5)/(-20)
x in { (385^(1/2)+5)/20, (385^(1/2)-5)/(-20) }
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