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k in (-oo:+oo)
(1/7)*k+7/9 = 95/126 // - 95/126
(1/7)*k+7/9-(95/126) = 0
(1/7)*k+7/9-95/126 = 0
1/7*k+1/42 = 0 // - 1/42
1/7*k = -1/42 // : 1/7
k = -1/42/1/7
k = -1/6
k = -1/6
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