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x in (-oo:+oo)
x^2 = 4/36 // - 4/36
x^2-(4/36) = 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 }
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