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k in (-oo:+oo)
6*k-9/10 = 111/10 // - 111/10
6*k-9/10-(111/10) = 0
6*k-9/10-111/10 = 0
6*k-12 = 0 // + 12
6*k = 12 // : 6
k = 12/6
k = 2
k = 2
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