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k in (-oo:+oo)
(9/2)*k = 5/8 // - 5/8
(9/2)*k-(5/8) = 0
(9/2)*k-5/8 = 0
9/2*k-5/8 = 0 // + 5/8
9/2*k = 5/8 // : 9/2
k = 5/8/9/2
k = 5/36
k = 5/36
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