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k in (-oo:+oo)
8/3 = k/15 // - k/15
8/3-(k/15) = 0
8/3-1/15*k = 0 // - 8/3
-1/15*k = -8/3 // : -1/15
k = -8/3/(-1/15)
k = 40
k = 40
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