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X in (-oo:+oo)
50*(1/2)*X^2 = 225 // - 225
50*(1/2)*X^2-225 = 0
25*X^2 = 225 // : 25
X^2 = 9
X^2 = 9 // ^ 1/2
abs(X) = 3
X = 3 or X = -3
X in { 3, -3 }
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