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X in (-oo:+oo)
(X^2)/6 = 7 // - 7
(X^2)/6-7 = 0
1/6*X^2 = 7 // : 1/6
X^2 = 42
X^2 = 42 // ^ 1/2
abs(X) = 42^(1/2)
X = 42^(1/2) or X = -42^(1/2)
X in { 42^(1/2), -42^(1/2) }
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