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