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x in (-oo:+oo)
((x-9)^2)/3 = 25 // - 25
((x-9)^2)/3-25 = 0
((x-9)^2)/3+(-25*3)/3 = 0
(x-9)^2-25*3 = 0
x^2-18*x+6 = 0
x^2-18*x+6 = 0
x^2-18*x+6 = 0
DELTA = (-18)^2-(1*4*6)
DELTA = 300
DELTA > 0
x = (300^(1/2)+18)/(1*2) or x = (18-300^(1/2))/(1*2)
x = (10*3^(1/2)+18)/2 or x = (18-10*3^(1/2))/2
(x-((18-10*3^(1/2))/2))*(x-((10*3^(1/2)+18)/2)) = 0
((x-((18-10*3^(1/2))/2))*(x-((10*3^(1/2)+18)/2)))/3 = 0
((x-((18-10*3^(1/2))/2))*(x-((10*3^(1/2)+18)/2)))/3 = 0 // * 3
(x-((18-10*3^(1/2))/2))*(x-((10*3^(1/2)+18)/2)) = 0
( x-((10*3^(1/2)+18)/2) )
x-((10*3^(1/2)+18)/2) = 0 // + (10*3^(1/2)+18)/2
x = (10*3^(1/2)+18)/2
( x-((18-10*3^(1/2))/2) )
x-((18-10*3^(1/2))/2) = 0 // + (18-10*3^(1/2))/2
x = (18-10*3^(1/2))/2
x in { (10*3^(1/2)+18)/2, (18-10*3^(1/2))/2 }
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