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k in (-oo:+oo)
(2/7)*k+10 = 214/21 // - 214/21
(2/7)*k-(214/21)+10 = 0
(2/7)*k-214/21+10 = 0
2/7*k-4/21 = 0 // + 4/21
2/7*k = 4/21 // : 2/7
k = 4/21/2/7
k = 2/3
k = 2/3
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