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x in (-oo:+oo)
((x-7)^2)/5 = 9 // - 9
((x-7)^2)/5-9 = 0
((x-7)^2)/5+(-9*5)/5 = 0
(x-7)^2-9*5 = 0
x^2-14*x+4 = 0
x^2-14*x+4 = 0
x^2-14*x+4 = 0
DELTA = (-14)^2-(1*4*4)
DELTA = 180
DELTA > 0
x = (180^(1/2)+14)/(1*2) or x = (14-180^(1/2))/(1*2)
x = (6*5^(1/2)+14)/2 or x = (14-6*5^(1/2))/2
(x-((14-6*5^(1/2))/2))*(x-((6*5^(1/2)+14)/2)) = 0
((x-((14-6*5^(1/2))/2))*(x-((6*5^(1/2)+14)/2)))/5 = 0
((x-((14-6*5^(1/2))/2))*(x-((6*5^(1/2)+14)/2)))/5 = 0 // * 5
(x-((14-6*5^(1/2))/2))*(x-((6*5^(1/2)+14)/2)) = 0
( x-((14-6*5^(1/2))/2) )
x-((14-6*5^(1/2))/2) = 0 // + (14-6*5^(1/2))/2
x = (14-6*5^(1/2))/2
( x-((6*5^(1/2)+14)/2) )
x-((6*5^(1/2)+14)/2) = 0 // + (6*5^(1/2)+14)/2
x = (6*5^(1/2)+14)/2
x in { (14-6*5^(1/2))/2, (6*5^(1/2)+14)/2 }
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