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