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x in (-oo:+oo)
(x-(2/5))^2 = 7 // - 7
(x-(2/5))^2-7 = 0
(x-2/5)^2-7 = 0
(x-2/5)^2-7 = 0
x^2-4/5*x-171/25 = 0
x^2-4/5*x-171/25 = 0
x^2-4/5*x-171/25 = 0
DELTA = (-4/5)^2-(-171/25*1*4)
DELTA = 28
DELTA > 0
x = (28^(1/2)+4/5)/(1*2) or x = (4/5-28^(1/2))/(1*2)
x = (2*7^(1/2)+4/5)/2 or x = (4/5-2*7^(1/2))/2
(x-((4/5-2*7^(1/2))/2))*(x-((2*7^(1/2)+4/5)/2)) = 0
(x-((4/5-2*7^(1/2))/2))*(x-((2*7^(1/2)+4/5)/2)) = 0
( x-((2*7^(1/2)+4/5)/2) )
x-((2*7^(1/2)+4/5)/2) = 0 // + (2*7^(1/2)+4/5)/2
x = (2*7^(1/2)+4/5)/2
( x-((4/5-2*7^(1/2))/2) )
x-((4/5-2*7^(1/2))/2) = 0 // + (4/5-2*7^(1/2))/2
x = (4/5-2*7^(1/2))/2
x in { (2*7^(1/2)+4/5)/2, (4/5-2*7^(1/2))/2 }
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