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k in (-oo:+oo)
(9*k+3)/4 = 4*(8-k) // - 4*(8-k)
(9*k+3)/4-(4*(8-k)) = 0
(9*k+3)/4-4*(8-k) = 0
(9*k+3)/4+(-4*4*(8-k))/4 = 0
9*k-4*4*(8-k)+3 = 0
25*k-125 = 0
(25*k-125)/4 = 0
(25*k-125)/4 = 0 // * 4
25*k-125 = 0
25*k-125 = 0 // + 125
25*k = 125 // : 25
k = 125/25
k = 5
k = 5
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