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k in (-oo:+oo)
-7*k-(9*k) = 8/3 // - 8/3
-7*k-(9*k)-(8/3) = 0
-7*k-9*k-8/3 = 0
-16*k-8/3 = 0 // + 8/3
-16*k = 8/3 // : -16
k = 8/3/(-16)
k = -1/6
k = -1/6
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