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k in (-oo:+oo)
k/18 = 1/9 // - 1/9
k/18-(1/9) = 0
k/18-1/9 = 0
1/18*k-1/9 = 0 // + 1/9
1/18*k = 1/9 // : 1/18
k = 1/9/1/18
k = 2
k = 2
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