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k in (-oo:+oo)
(3/7)*k+10 = 82/7 // - 82/7
(3/7)*k-(82/7)+10 = 0
(3/7)*k-82/7+10 = 0
3/7*k-12/7 = 0 // + 12/7
3/7*k = 12/7 // : 3/7
k = 12/7/3/7
k = 4
k = 4
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