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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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