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