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D( x )
1-3*x = 0
1-3*x = 0
1-3*x = 0
1-3*x = 0 // - 1
-3*x = -1 // : -3
x = -1/(-3)
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
(2*x+5)/(1-3*x) = 2*x-2*5 // - 2*x-2*5
(2*x+5)/(1-3*x)-(2*x)-(-2*5) = 0
(2*x+5)/(1-3*x)-2*x+10 = 0
(2*x+5)/(1-3*x)+(-2*x*(1-3*x))/(1-3*x)+(10*(1-3*x))/(1-3*x) = 0
10*(1-3*x)-2*x*(1-3*x)+2*x+5 = 0
6*x^2-30*x+5+10 = 0
6*x^2-30*x+15 = 0
6*x^2-30*x+15 = 0
3*(2*x^2-10*x+5) = 0
2*x^2-10*x+5 = 0
DELTA = (-10)^2-(2*4*5)
DELTA = 60
DELTA > 0
x = (60^(1/2)+10)/(2*2) or x = (10-60^(1/2))/(2*2)
x = (2*15^(1/2)+10)/4 or x = (10-2*15^(1/2))/4
3*(x-((10-2*15^(1/2))/4))*(x-((2*15^(1/2)+10)/4)) = 0
(3*(x-((10-2*15^(1/2))/4))*(x-((2*15^(1/2)+10)/4)))/(1-3*x) = 0
(3*(x-((10-2*15^(1/2))/4))*(x-((2*15^(1/2)+10)/4)))/(1-3*x) = 0 // * 1-3*x
3*(x-((10-2*15^(1/2))/4))*(x-((2*15^(1/2)+10)/4)) = 0
( x-((10-2*15^(1/2))/4) )
x-((10-2*15^(1/2))/4) = 0 // + (10-2*15^(1/2))/4
x = (10-2*15^(1/2))/4
( x-((2*15^(1/2)+10)/4) )
x-((2*15^(1/2)+10)/4) = 0 // + (2*15^(1/2)+10)/4
x = (2*15^(1/2)+10)/4
x in { (10-2*15^(1/2))/4, (2*15^(1/2)+10)/4 }
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