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k in (-oo:+oo)
(-1*k)/3 = -2 // + 2
(-1*k)/3+2 = 0
2-k/3 = 0
2-1/3*k = 0 // - 2
-1/3*k = -2 // : -1/3
k = -2/(-1/3)
k = 6
k = 6
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