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x in (-oo:+oo)
(x^2)/6-4 = 22 // - 22
(x^2)/6-22-4 = 0
1/6*x^2 = 26 // : 1/6
x^2 = 156
x^2 = 156 // ^ 1/2
abs(x) = 2*39^(1/2)
x = 2*39^(1/2) or x = -(2*39^(1/2))
x in { 2*39^(1/2), -(2*39^(1/2)) }
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