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4*x^2-(1/9) = 0
4*x^2-1/9 = 0
4*x^2 = 1/9 // : 4
x^2 = 1/36
x^2 = 1/36 // ^ 1/2
abs(x) = 1/6
x = 1/6 or x = -1/6
x in { 1/6, -1/6 }
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