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k in (-oo:+oo)
k^2 = 49/16 // - 49/16
k^2-(49/16) = 0
k^2-49/16 = 0
1*k^2 = 49/16 // : 1
k^2 = 49/16
k^2 = 49/16 // ^ 1/2
abs(k) = 7/4
k = 7/4 or k = -7/4
k in { 7/4, -7/4 }
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