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