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k in (-oo:+oo)
3/5-k = 4/15 // - 4/15
3/5-k-(4/15) = 0
3/5-k-4/15 = 0
1/3-k = 0 // - 1/3
-k = -1/3 // * -1
k = 1/3
k = 1/3
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