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x in (-oo:+oo)
((x-6)^2)/5 = 4 // - 4
((x-6)^2)/5-4 = 0
((x-6)^2)/5+(-4*5)/5 = 0
(x-6)^2-4*5 = 0
x^2-12*x+16 = 0
x^2-12*x+16 = 0
x^2-12*x+16 = 0
DELTA = (-12)^2-(1*4*16)
DELTA = 80
DELTA > 0
x = (80^(1/2)+12)/(1*2) or x = (12-80^(1/2))/(1*2)
x = (4*5^(1/2)+12)/2 or x = (12-4*5^(1/2))/2
(x-((12-4*5^(1/2))/2))*(x-((4*5^(1/2)+12)/2)) = 0
((x-((12-4*5^(1/2))/2))*(x-((4*5^(1/2)+12)/2)))/5 = 0
((x-((12-4*5^(1/2))/2))*(x-((4*5^(1/2)+12)/2)))/5 = 0 // * 5
(x-((12-4*5^(1/2))/2))*(x-((4*5^(1/2)+12)/2)) = 0
( x-((12-4*5^(1/2))/2) )
x-((12-4*5^(1/2))/2) = 0 // + (12-4*5^(1/2))/2
x = (12-4*5^(1/2))/2
( x-((4*5^(1/2)+12)/2) )
x-((4*5^(1/2)+12)/2) = 0 // + (4*5^(1/2)+12)/2
x = (4*5^(1/2)+12)/2
x in { (12-4*5^(1/2))/2, (4*5^(1/2)+12)/2 }
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