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x in (-oo:+oo)
X*x*x = 27/216 // - 27/216
X*x*x-(27/216) = 0
X*x*x-1/8 = 0
X*x^2 = 1/8 // : X
x^2 = 1/8/X
x^2 = 1/8/X // ^ 1/2
abs(x) = ((1/8)^(1/2))/(X^(1/2))
x = ((1/8)^(1/2))/(X^(1/2)) or x = -(((1/8)^(1/2))/(X^(1/2)))
x in { ((1/8)^(1/2))/(X^(1/2)), -(((1/8)^(1/2))/(X^(1/2))) }
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