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x in (-oo:+oo)
((x-9)^2)/5 = 4 // - 4
((x-9)^2)/5-4 = 0
((x-9)^2)/5+(-4*5)/5 = 0
(x-9)^2-4*5 = 0
x^2-18*x+61 = 0
x^2-18*x+61 = 0
x^2-18*x+61 = 0
DELTA = (-18)^2-(1*4*61)
DELTA = 80
DELTA > 0
x = (80^(1/2)+18)/(1*2) or x = (18-80^(1/2))/(1*2)
x = (4*5^(1/2)+18)/2 or x = (18-4*5^(1/2))/2
(x-((18-4*5^(1/2))/2))*(x-((4*5^(1/2)+18)/2)) = 0
((x-((18-4*5^(1/2))/2))*(x-((4*5^(1/2)+18)/2)))/5 = 0
((x-((18-4*5^(1/2))/2))*(x-((4*5^(1/2)+18)/2)))/5 = 0 // * 5
(x-((18-4*5^(1/2))/2))*(x-((4*5^(1/2)+18)/2)) = 0
( x-((18-4*5^(1/2))/2) )
x-((18-4*5^(1/2))/2) = 0 // + (18-4*5^(1/2))/2
x = (18-4*5^(1/2))/2
( x-((4*5^(1/2)+18)/2) )
x-((4*5^(1/2)+18)/2) = 0 // + (4*5^(1/2)+18)/2
x = (4*5^(1/2)+18)/2
x in { (18-4*5^(1/2))/2, (4*5^(1/2)+18)/2 }
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