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k in (-oo:+oo)
4*k+5/6 = 221/6 // - 221/6
4*k+5/6-(221/6) = 0
4*k+5/6-221/6 = 0
4*k-36 = 0 // + 36
4*k = 36 // : 4
k = 36/4
k = 9
k = 9
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