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k in (-oo:+oo)
12*k^2-(((12*k)/18)*k^2) = 0
(-2/3)*k^3+12*k^2 = 0
12*k^2-2/3*k^3 = 0
2*k^2*(6-1/3*k) = 0
6-1/3*k = 0 // - 6
-1/3*k = -6 // : -1/3
k = -6/(-1/3)
k = 18
2*k^2 = 0
2*k^2 = 0 // : 2
k^2 = 0
k = 0
k in { 18, 0 }
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