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x in (-oo:+oo)
54/6-(3*x^2) = 0
54/6-3*x^2 = 0
-3*x^2 = -9 // : -3
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in { 3^(1/2), -3^(1/2) }
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