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X in (-oo:+oo)
((X-2)^2)/5 = 9 // - 9
((X-2)^2)/5-9 = 0
((X-2)^2)/5+(-9*5)/5 = 0
(X-2)^2-9*5 = 0
X^2-4*X-41 = 0
X^2-4*X-41 = 0
X^2-4*X-41 = 0
DELTA = (-4)^2-(-41*1*4)
DELTA = 180
DELTA > 0
X = (180^(1/2)+4)/(1*2) or X = (4-180^(1/2))/(1*2)
X = (6*5^(1/2)+4)/2 or X = (4-6*5^(1/2))/2
(X-((4-6*5^(1/2))/2))*(X-((6*5^(1/2)+4)/2)) = 0
((X-((4-6*5^(1/2))/2))*(X-((6*5^(1/2)+4)/2)))/5 = 0
((X-((4-6*5^(1/2))/2))*(X-((6*5^(1/2)+4)/2)))/5 = 0 // * 5
(X-((4-6*5^(1/2))/2))*(X-((6*5^(1/2)+4)/2)) = 0
( X-((4-6*5^(1/2))/2) )
X-((4-6*5^(1/2))/2) = 0 // + (4-6*5^(1/2))/2
X = (4-6*5^(1/2))/2
( X-((6*5^(1/2)+4)/2) )
X-((6*5^(1/2)+4)/2) = 0 // + (6*5^(1/2)+4)/2
X = (6*5^(1/2)+4)/2
X in { (4-6*5^(1/2))/2, (6*5^(1/2)+4)/2 }
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