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k in (-oo:+oo)
k^2-(7/11) = 0
k^2-7/11 = 0
1*k^2 = 7/11 // : 1
k^2 = 7/11
k^2 = 7/11 // ^ 1/2
abs(k) = (7/11)^(1/2)
k = (7/11)^(1/2) or k = -(7/11)^(1/2)
k in { (7/11)^(1/2), -(7/11)^(1/2) }
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