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k in (-oo:+oo)
(4/3)*k-9 = 5 // - 5
(4/3)*k-9-5 = 0
4/3*k-14 = 0 // + 14
4/3*k = 14 // : 4/3
k = 14/4/3
k = 21/2
k = 21/2
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