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k in (-oo:+oo)
(31/4)*k = 25/6 // - 25/6
(31/4)*k-(25/6) = 0
(31/4)*k-25/6 = 0
31/4*k-25/6 = 0 // + 25/6
31/4*k = 25/6 // : 31/4
k = 25/6/31/4
k = 50/93
k = 50/93
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