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k in (-oo:+oo)
(31/2)*k = 51/4 // - 51/4
(31/2)*k-(51/4) = 0
(31/2)*k-51/4 = 0
31/2*k-51/4 = 0 // + 51/4
31/2*k = 51/4 // : 31/2
k = 51/4/31/2
k = 51/62
k = 51/62
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