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k in (-oo:+oo)
6-4*k = 44/5 // - 44/5
6-4*k-(44/5) = 0
6-4*k-44/5 = 0
-4*k-14/5 = 0 // + 14/5
-4*k = 14/5 // : -4
k = 14/5/(-4)
k = -7/10
k = -7/10
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