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k in (-oo:+oo)
79/42 = k+5/7 // - k+5/7
79/42-k-(5/7) = 0
79/42-k-5/7 = 0
7/6-k = 0 // - 7/6
-k = -7/6 // * -1
k = 7/6
k = 7/6
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