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k in (-oo:+oo)
4*k+6 = 20/3 // - 20/3
4*k-(20/3)+6 = 0
4*k-20/3+6 = 0
4*k-2/3 = 0 // + 2/3
4*k = 2/3 // : 4
k = 2/3/4
k = 1/6
k = 1/6
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