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k in (-oo:+oo)
(3/7)*k = 8/12 // - 8/12
(3/7)*k-(8/12) = 0
(3/7)*k-2/3 = 0
3/7*k-2/3 = 0 // + 2/3
3/7*k = 2/3 // : 3/7
k = 2/3/3/7
k = 14/9
k = 14/9
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