X^2-(1/9)

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X in (-oo:+oo)

X^2-(1/9) = 0

X^2-1/9 = 0

1*X^2 = 1/9 // : 1

X^2 = 1/9

X^2 = 1/9 // ^ 1/2

abs(X) = 1/3

X = 1/3 or X = -1/3

X in { 1/3, -1/3 }