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k in (-oo:+oo)
(4/5)*k+9 = 57/5 // - 57/5
(4/5)*k-(57/5)+9 = 0
(4/5)*k-57/5+9 = 0
4/5*k-12/5 = 0 // + 12/5
4/5*k = 12/5 // : 4/5
k = 12/5/4/5
k = 3
k = 3
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