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k in (-oo:+oo)
k/5 = 8/9 // - 8/9
k/5-(8/9) = 0
k/5-8/9 = 0
1/5*k-8/9 = 0 // + 8/9
1/5*k = 8/9 // : 1/5
k = 8/9/1/5
k = 40/9
k = 40/9
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