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k in (-oo:+oo)
43 = ((5*k)/1)*k // - ((5*k)/1)*k
43-(((5*k)/1)*k) = 0
43-5*k^2 = 0
-5*k^2 = -43 // : -5
k^2 = 43/5
k^2 = 43/5 // ^ 1/2
abs(k) = (43/5)^(1/2)
k = (43/5)^(1/2) or k = -(43/5)^(1/2)
k in { (43/5)^(1/2), -(43/5)^(1/2) }
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