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k in (-oo:+oo)
k/9 = 10/18 // - 10/18
k/9-(10/18) = 0
k/9-5/9 = 0
1/9*k-5/9 = 0 // + 5/9
1/9*k = 5/9 // : 1/9
k = 5/9/1/9
k = 5
k = 5
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