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k in (-oo:+oo)
3*(1*k+2) = 6 // - 6
3*(1*k+2)-6 = 0
3*(k+2)-6 = 0
3*(k+2)-6 = 0
3*k = 0
3*k = 0
3*k = 0 // : 3
k = 0
k = 0
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