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k in (-oo:+oo)
k/9 = 6/12 // - 6/12
k/9-(6/12) = 0
k/9-1/2 = 0
1/9*k-1/2 = 0 // + 1/2
1/9*k = 1/2 // : 1/9
k = 1/2/1/9
k = 9/2
k = 9/2
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