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k in (-oo:+oo)
k/(-9) = 1/3 // - 1/3
k/(-9)-(1/3) = 0
k/(-9)-1/3 = 0
-1/9*k-1/3 = 0 // + 1/3
-1/9*k = 1/3 // : -1/9
k = 1/3/(-1/9)
k = -3
k = -3
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