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X in (-oo:+oo)
X^2-(16/9) = 0
X^2-16/9 = 0
1*X^2 = 16/9 // : 1
X^2 = 16/9
X^2 = 16/9 // ^ 1/2
abs(X) = 4/3
X = 4/3 or X = -4/3
X in { 4/3, -4/3 }
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