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k in (-oo:+oo)
3/7 = k/29 // - k/29
3/7-(k/29) = 0
3/7-1/29*k = 0 // - 3/7
-1/29*k = -3/7 // : -1/29
k = -3/7/(-1/29)
k = 87/7
k = 87/7
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