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k in (-oo:+oo)
(2/5)*k = 9/5 // - 9/5
(2/5)*k-(9/5) = 0
(2/5)*k-9/5 = 0
2/5*k-9/5 = 0 // + 9/5
2/5*k = 9/5 // : 2/5
k = 9/5/2/5
k = 9/2
k = 9/2
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