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k in (-oo:+oo)
3^3-(2*k) > 1/27 // - 1/27
3^3-(2*k)-(1/27) > 0
3^3-2*k-1/27 > 0
728/27-2*k > 0 // - 728/27
-2*k > -728/27 // : -2
k < -728/27/(-2)
k < 364/27
k in (-oo:364/27)
(-oo:364/27)
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