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x in (-oo:+oo)
10 = (x^2)/5 // - (x^2)/5
10-((x^2)/5) = 0
-1/5*x^2 = -10 // : -1/5
x^2 = 50
x^2 = 50 // ^ 1/2
abs(x) = 5*2^(1/2)
x = 5*2^(1/2) or x = -(5*2^(1/2))
x in { 5*2^(1/2), -(5*2^(1/2)) }
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