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x in (-oo:+oo)
((3*x)^2*x^2)/3 = 54 // - 54
((3*x)^2*x^2)/3-54 = 0
3*x^4 = 54 // : 3
x^4 = 18
x^4 = 18 // ^ 1/4
abs(x) = 18^(1/4)
x = 18^(1/4) or x = -18^(1/4)
x in { 18^(1/4), -18^(1/4) }
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