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k in (-oo:+oo)
4/6 = k/16 // - k/16
4/6-(k/16) = 0
2/3-1/16*k = 0 // - 2/3
-1/16*k = -2/3 // : -1/16
k = -2/3/(-1/16)
k = 32/3
k = 32/3
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