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k in (-oo:+oo)
(4/5)*k+2 = 106/45 // - 106/45
(4/5)*k-(106/45)+2 = 0
(4/5)*k-106/45+2 = 0
4/5*k-16/45 = 0 // + 16/45
4/5*k = 16/45 // : 4/5
k = 16/45/4/5
k = 4/9
k = 4/9
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