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x in (-oo:+oo)
14-7 = (x^2)/3 // - (x^2)/3
14-((x^2)/3)-7 = 0
-1/3*x^2 = -7 // : -1/3
x^2 = 21
x^2 = 21 // ^ 1/2
abs(x) = 21^(1/2)
x = 21^(1/2) or x = -21^(1/2)
x in { 21^(1/2), -21^(1/2) }
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