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k in (-oo:+oo)
(10/3)*k = 2/5 // - 2/5
(10/3)*k-(2/5) = 0
(10/3)*k-2/5 = 0
10/3*k-2/5 = 0 // + 2/5
10/3*k = 2/5 // : 10/3
k = 2/5/10/3
k = 3/25
k = 3/25
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