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x in (-oo:+oo)
x^2 = 7/18 // - 7/18
x^2-(7/18) = 0
x^2-7/18 = 0
1*x^2 = 7/18 // : 1
x^2 = 7/18
x^2 = 7/18 // ^ 1/2
abs(x) = (7/18)^(1/2)
x = (7/18)^(1/2) or x = -(7/18)^(1/2)
x in { (7/18)^(1/2), -(7/18)^(1/2) }
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