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k in (-oo:+oo)
5*k-(6*k)-1/7 = 2/35 // - 2/35
5*k-(6*k)-1/7-(2/35) = 0
5*k-6*k-1/7-2/35 = 0
-k-1/5 = 0 // + 1/5
-k = 1/5 // * -1
k = -1/5
k = -1/5
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