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k in (-oo:+oo)
3*k+6 = 20/3 // - 20/3
3*k-(20/3)+6 = 0
3*k-20/3+6 = 0
3*k-2/3 = 0 // + 2/3
3*k = 2/3 // : 3
k = 2/3/3
k = 2/9
k = 2/9
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