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