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k in (-oo:+oo)
(68/21)*k = 131/3 // - 131/3
(68/21)*k-(131/3) = 0
(68/21)*k-131/3 = 0
68/21*k-131/3 = 0 // + 131/3
68/21*k = 131/3 // : 68/21
k = 131/3/68/21
k = 917/68
k = 917/68
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