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k in (-oo:+oo)
35/42 = k/6 // - k/6
35/42-(k/6) = 0
5/6-1/6*k = 0 // - 5/6
-1/6*k = -5/6 // : -1/6
k = -5/6/(-1/6)
k = 5
k = 5
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