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k in (-oo:+oo)
(2/7)*k+6*k+7 = 82/7 // - 82/7
(2/7)*k+6*k-(82/7)+7 = 0
(2/7)*k+6*k-82/7+7 = 0
44/7*k-33/7 = 0 // + 33/7
44/7*k = 33/7 // : 44/7
k = 33/7/44/7
k = 3/4
k = 3/4
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