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x in (-oo:+oo)
6*x^2-(3*x^2) = 1/36 // - 1/36
6*x^2-(3*x^2)-(1/36) = 0
6*x^2-3*x^2-1/36 = 0
3*x^2 = 1/36 // : 3
x^2 = 1/108
x^2 = 1/108 // ^ 1/2
abs(x) = (1/108)^(1/2)
x = (1/108)^(1/2) or x = -(1/108)^(1/2)
x in { (1/108)^(1/2), -(1/108)^(1/2) }
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