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x in (-oo:+oo)
27 = (x^2)/3 // - (x^2)/3
27-((x^2)/3) = 0
-1/3*x^2 = -27 // : -1/3
x^2 = 81
x^2 = 81 // ^ 1/2
abs(x) = 9
x = 9 or x = -9
x in { 9, -9 }
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