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x in (-oo:+oo)
(3/12)^3 = x^2 // - x^2
(3/12)^3-x^2 = 0
-1*x^2 = -1/64 // : -1
x^2 = 1/64
x^2 = 1/64 // ^ 1/2
abs(x) = 1/8
x = 1/8 or x = -1/8
x in { 1/8, -1/8 }
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