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