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k in (-oo:+oo)
(4/5)*k = 5/3 // - 5/3
(4/5)*k-(5/3) = 0
(4/5)*k-5/3 = 0
4/5*k-5/3 = 0 // + 5/3
4/5*k = 5/3 // : 4/5
k = 5/3/4/5
k = 25/12
k = 25/12
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