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x in (-oo:+oo)
((5*x-5)^2)/3-3 = 13 // - 13
((5*x-5)^2)/3-13-3 = 0
((5*x-5)^2)/3+(-13*3)/3+(-3*3)/3 = 0
(5*x-5)^2-13*3-3*3 = 0
25*x^2-50*x-14-9 = 0
25*x^2-50*x-23 = 0
25*x^2-50*x-23 = 0
25*x^2-50*x-23 = 0
DELTA = (-50)^2-(-23*4*25)
DELTA = 4800
DELTA > 0
x = (4800^(1/2)+50)/(2*25) or x = (50-4800^(1/2))/(2*25)
x = (40*3^(1/2)+50)/50 or x = (50-40*3^(1/2))/50
(x-((50-40*3^(1/2))/50))*(x-((40*3^(1/2)+50)/50)) = 0
((x-((50-40*3^(1/2))/50))*(x-((40*3^(1/2)+50)/50)))/3 = 0
((x-((50-40*3^(1/2))/50))*(x-((40*3^(1/2)+50)/50)))/3 = 0 // * 3
(x-((50-40*3^(1/2))/50))*(x-((40*3^(1/2)+50)/50)) = 0
( x-((40*3^(1/2)+50)/50) )
x-((40*3^(1/2)+50)/50) = 0 // + (40*3^(1/2)+50)/50
x = (40*3^(1/2)+50)/50
( x-((50-40*3^(1/2))/50) )
x-((50-40*3^(1/2))/50) = 0 // + (50-40*3^(1/2))/50
x = (50-40*3^(1/2))/50
x in { (40*3^(1/2)+50)/50, (50-40*3^(1/2))/50 }
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