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k in (-oo:+oo)
9-3*k = 4*k+73/12 // - 4*k+73/12
9-3*k-(4*k)-(73/12) = 0
9-3*k-4*k-73/12 = 0
35/12-7*k = 0 // - 35/12
-7*k = -35/12 // : -7
k = -35/12/(-7)
k = 5/12
k = 5/12
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