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k in (-oo:+oo)
13-((4-k)/9) = 0
(-1*(4-k))/9+13 = 0
(-1*(4-k))/9+(9*13)/9 = 0
9*13-1*(4-k) = 0
k+113 = 0
(k+113)/9 = 0
(k+113)/9 = 0 // * 9
k+113 = 0
k+113 = 0 // - 113
k = -113
k = -113
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