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k in (-oo:+oo)
(1/3)*k = 291/120 // - 291/120
(1/3)*k-(291/120) = 0
(1/3)*k-97/40 = 0
1/3*k-97/40 = 0 // + 97/40
1/3*k = 97/40 // : 1/3
k = 97/40/1/3
k = 291/40
k = 291/40
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