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x in (-oo:+oo)
((5*x-1)^2)/5 = 7 // - 7
((5*x-1)^2)/5-7 = 0
((5*x-1)^2)/5+(-7*5)/5 = 0
(5*x-1)^2-7*5 = 0
25*x^2-10*x-34 = 0
25*x^2-10*x-34 = 0
25*x^2-10*x-34 = 0
DELTA = (-10)^2-(-34*4*25)
DELTA = 3500
DELTA > 0
x = (3500^(1/2)+10)/(2*25) or x = (10-3500^(1/2))/(2*25)
x = (10*35^(1/2)+10)/50 or x = (10-10*35^(1/2))/50
(x-((10-10*35^(1/2))/50))*(x-((10*35^(1/2)+10)/50)) = 0
((x-((10-10*35^(1/2))/50))*(x-((10*35^(1/2)+10)/50)))/5 = 0
((x-((10-10*35^(1/2))/50))*(x-((10*35^(1/2)+10)/50)))/5 = 0 // * 5
(x-((10-10*35^(1/2))/50))*(x-((10*35^(1/2)+10)/50)) = 0
( x-((10*35^(1/2)+10)/50) )
x-((10*35^(1/2)+10)/50) = 0 // + (10*35^(1/2)+10)/50
x = (10*35^(1/2)+10)/50
( x-((10-10*35^(1/2))/50) )
x-((10-10*35^(1/2))/50) = 0 // + (10-10*35^(1/2))/50
x = (10-10*35^(1/2))/50
x in { (10*35^(1/2)+10)/50, (10-10*35^(1/2))/50 }
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