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k in (-oo:+oo)
3/5 = k/4 // - k/4
3/5-(k/4) = 0
3/5-1/4*k = 0 // - 3/5
-1/4*k = -3/5 // : -1/4
k = -3/5/(-1/4)
k = 12/5
k = 12/5
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