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(x^2)/5 = w+y // - w+y
(x^2)/5-w-y = 0
1/5*x^2 = -(-w-y) // : 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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