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