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x in (-oo:+oo)
(x^2)/5 = 25 // - 25
(x^2)/5-25 = 0
1/5*x^2 = 25 // : 1/5
x^2 = 125
x^2 = 125 // ^ 1/2
abs(x) = 5*5^(1/2)
x = 5*5^(1/2) or x = -(5*5^(1/2))
x in { 5*5^(1/2), -(5*5^(1/2)) }
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