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X in (-oo:+oo)
1-((1/20)*X^2) = 0
(-1/20)*X^2+1 = 0
-1/20*X^2 = -1 // : -1/20
X^2 = 20
X^2 = 20 // ^ 1/2
abs(X) = 2*5^(1/2)
X = 2*5^(1/2) or X = -(2*5^(1/2))
X in { 2*5^(1/2), -(2*5^(1/2)) }
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