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x in (-oo:+oo)
(x/0.5)*x = 23000 // - 23000
(x/0.5)*x-23000 = 0
2*x^2 = 23000 // : 2
x^2 = 11500
x^2 = 11500 // ^ 1/2
abs(x) = 10*115^(1/2)
x = 10*115^(1/2) or x = -(10*115^(1/2))
x in { 10*115^(1/2), -(10*115^(1/2)) }
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