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