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x in (-oo:+oo)
(x^2)/3 = 7/2 // - 7/2
(x^2)/3-(7/2) = 0
(x^2)/3-7/2 = 0
1/3*x^2 = 7/2 // : 1/3
x^2 = 21/2
x^2 = 21/2 // ^ 1/2
abs(x) = (21/2)^(1/2)
x = (21/2)^(1/2) or x = -(21/2)^(1/2)
x in { (21/2)^(1/2), -(21/2)^(1/2) }
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