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k in (-oo:+oo)
3 = k/1.5 // - k/1.5
3-(k/1.5) = 0
3-0.66666667*k = 0
3-0.66666667*k = 0 // - 3
-0.66666667*k = -3 // : -0.66666667
k = -3/(-0.66666667)
k = 4.49999998
k = 4.49999998
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