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k in (-oo:+oo)
3*(1*k-1) = 6 // - 6
3*(1*k-1)-6 = 0
3*(k-1)-6 = 0
3*(k-1)-6 = 0
3*k-9 = 0
3*k-9 = 0
3*k-9 = 0 // + 9
3*k = 9 // : 3
k = 9/3
k = 3
k = 3
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