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k in (-oo:+oo)
k/6 = k/5+9 // - k/5+9
k/6-(k/5)-9 = 0
-1/30*k-9 = 0 // + 9
-1/30*k = 9 // : -1/30
k = 9/(-1/30)
k = -270
k = -270
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