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x in (-oo:+oo)
(1/27)*x^2 = 4.6875 // - 4.6875
(1/27)*x^2-4.6875 = 0
1/27*x^2 = 4.6875 // : 1/27
x^2 = 126.56248988
x^2 = 126.56248988 // ^ 1/2
abs(x) = 126.56248988^(1/2)
x = 126.56248988^(1/2) or x = -126.56248988^(1/2)
x in { 126.56248988^(1/2), -126.56248988^(1/2) }
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