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k in (-oo:+oo)
(1/2)*k-3 = 12-(9*k) // - 12-(9*k)
(1/2)*k+9*k-12-3 = 0
19/2*k-15 = 0 // + 15
19/2*k = 15 // : 19/2
k = 15/19/2
k = 30/19
k = 30/19
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