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x in (-oo:+oo)
x^2 = 8000/y // - 8000/y
x^2-(8000/y) = 0
x^2-8000*y^-1 = 0
1*x^2 = -(-8000*y^-1) // : 1
x^2 = 8000*y^-1
x^2 = 8000*y^-1 // ^ 1/2
abs(x) = 40*5^(1/2)*y^(-1/2)
x = 40*5^(1/2)*y^(-1/2) or x = -(40*5^(1/2)*y^(-1/2))
x in { 40*5^(1/2)*y^(-1/2), -(40*5^(1/2)*y^(-1/2)) }
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